|
|
Applied Ballistics Mobile Application For Android (iPhone/iPad coming soon) |
The Applied Ballistics Mobile Application is the most
versatile, accurate and user friendly ballistics program available. This page is dedicated to presenting operational
requirements, along with the many features and their proper use.
|
Sections |
|
|
|
|
|
|
Some rifle inputs |
Some ammo inputs |
Reticle
output view |
Table output view |
Features
The following table lists the features of the Applied Ballistics Mobile app and gives a brief explanation of what they are/do. Greater detail along with directions for how to properly use all the features is given below in the instructional sections of this page.
|
Highly Accurate Ballistics Engine |
The Applied Ballistics Mobile App runs a
Point Mass ballistic solver. The program
integrates the equations of ballistic motion numerically, using a 4th order Runge-Kutta routine at 1000 Hz. This is a standard way of solving dynamic
equations of motion in aircraft and missile simulations. This particular solver was written by former
missile design engineer and current ballistician Bryan Litz. |
|
Multiple Drag Models and stepped BC's |
Reference you're projectiles Ballistic
Coefficient (BC) to either the old G1 standard, or the more representative G7
standard (read this article to learn about G1 and G7
BC's). You can use average BC's, or
enter BC's by velocity band. |
|
Custom Drag Curves |
In the advanced version of the Applied Ballistics
Mobile App, you can download custom drag curves to model a specific bullet,
rather than referencing drag to a standard.
Using custom drag curves enables more accurate trajectory predictions
for projectiles that slow to and below transonic speed which happens when
shooting at Extended Long Range (ELR).
Additional custom drag curves will be added based on user
request. Email:
support@appliedballisticsllc.com to request additional drag functions. |
|
Firearm/Ammo
Profiles |
Build and store custom profiles that
characterize your specific rifles, sights, and ammo for easy recall. |
|
Web Sync
Profiles |
After you've spent
the time to enter in all of your rifle and load data, it would be unpleasant
to lose all of that data after you accidentally dropped your phone in the
toilet. You can use the Web Sync Profiles option to backup all your profiles
online or to restore them to a device.
|
|
Bullet Library |
The Applied Ballistics Mobile App currently has over 1,300 bullets available in the built-in library including Bryan Litz' measured ballistic coefficients for over 225 popular bullets. This allows you to easily select your bullet and have its data loaded into your ammo profile automatically. The bullet library will continue to expand in future updates. |
|
Distance Calculator |
Use the
built-in distance calculator to estimate target range using your scope's reticle (supports MOA, IPHY and Mils). |
|
Angle
Detection |
Use your
device's accelerometer to determine look angle (up/downhill shot). Simply
turn on the angle detector and point device at target. |
|
Automatic
Atmosphere |
Automatically populate
Altitude, Temperature, Pressure, Humidity and Wind Speed by pulling data from
the nearest weather station based off GPS location (Density Altitude may also
be used instead of altitude/pressure/humidity input). |
|
Zero
Atmosphere |
You can specify
atmospheric conditions during the time you sighted in your rifle into each
ammo profile and the ballistic solution will automatically correct for it.
This is particularly useful for those who use longer zero ranges (>100
yards/meters) and shoot in an atmosphere that's vastly different from what
they zeroed in. |
|
Atmosphere from
Kestrel |
If you have a
Bluetooth-enabled Kestrel device, you can load the atmosphere straight from
your Kestrel into the program. Note: You must download the free plugin which is available in the Market. Android version
only. |
|
Coriolis Effect & Spin Drift |
You can figure
in Coriolis acceleration and/or gyroscopic drift
(spin drift) into your
solution. You can use your device to acquire your latitude and the target's
Azimuth (for Coriolis). Note: Spin Drift is only available if you enter
both barrel twist and bullet length in the rifle and ammo profile. Both Coriolis effects and spin drift are
optional features, easily disabled by un-checking a box. |
|
Powder
Temperature |
You can specify
your load's powder temperature at time you chronographed
along with the variation of muzzle velocity (fps/mps) per degree (F/C) and
the app will automatically adjust the muzzle velocity based on current powder
temperature. |
|
Graphs |
Compare
trajectory and windage for up to 6 loads at once in
a full color graph (see screenshots below). |
|
Interactive
HUD Output View |
Elevation, windage and lead solutions are presented in large and easy to see font for your desired correction unit (MOA, IPHY or Mils). You can easily tap-in changes to distance, wind, wind direction, lead and lead direction or invoke the distance calculator, angle detector or azimuth detector and the solutions will be auto-recomputed upon any changes to input. |
|
Reticle Output View |
For those
shooters who prefer to hold their corrections in the scope rather than dial
corrections on the turret, the reticle output view shows
precisely where to hold for your specific shot or gives you continuous data
for a full trajectory. Some common reticles are built into both the standard and advanced
app, and many more popular reticles are available
for download as in-app purchases. |
|
Share
Trajectory Table via Email |
Send the trajectory table output to any email address. |
|
Ballistic Calibration |
Sometimes it's
not possible to accurately determine all the variables required to calculate
an exact ballistic solution. As a result,
the Point Of Impact (POI) predicted by the program can be a little different
from where the actual bullet hits in the real world. One of the more powerful features of the
Applied Ballistics Mobile App is the 3 modes of Ballistic Calibration. A
user can calibrate the program based on real world observed drop data at
range by inputting pairs of observed range/drop data, and the program will
calibrate itself to your data point by modifying either: muzzle velocity,
drag, or simply by scaling the computed drop.
As one of the most powerful features only available in the advanced
version of the application, the proper use of Ballistic Calibration requires
a user to learn the details of how to use it correctly. Full instructions on all 3 modes are given below
in the instructions. |
|
Reticle
Output Views |
The
effectiveness of a ballistics application goes beyond simply providing raw
elevation and windage adjustments. To fully leverage the accurate fire
solutions, the AB Mobile app provides reticle
output views which graphically shows where to hold in the context of a given reticle for a particular shot. New reticles will
be added to the library based on user request. Email: support@appliedballisticsllc.com to
request additional reticles. |
|
Dark Theme |
There is a dark-colored theme available to those who prefer that. |
|
Metric
Support |
Data inputs/output can be configured to use Metric units. |
|
* Features listed above in Bold Red are advanced features that are
not available in most ballistics programs. |
|
Requirements
·
Android v2.2 or higher
·
GPS is required for "Automatic Latitude" and "Auto
Atmosphere", explained in detail below
·
Internet is required for "Auto Atmosphere" and "Web
Sync" features
·
Bluetooth support is required for Kestrel integration
·
An Accelerometer is required to use the Look Angle acquisition
tool
NOT Required
·
You do not need GPS, Internet, Bluetooth or cell
service to run calculations
Operation Overview
The general flow of the program is in-line with the natural
flow of information for a typical shooting engagement. Libraries of rifles and ammo are pre-built so
when you're in the field, you simply choose a rifle, ammo, and progress to the
environment inputs where you enter all the specific details of your current
environment. Finally you choose the
solution view that best suits your shooting objective. The following sections cover the details of
operation.
Inputs
This section covers the various inputs required to
build; rifle profiles, ammo profiles, and describe the target and environment
to the ballistic solver. It's important
to note that the more accurate the inputs are, the more accurate the output
will be. If you rush thru the inputs and
only use approximate numbers, the output will be correspondingly approximate.
However if truly accurate inputs are gathered and input, this
program is capable of highly accurate predictive fire solutions.
Rifle Library
When first opened, the application shows the rifle library
which will be blank the first time you run the program. Touch the 'Add Firearm' button to open the
screen where you'll enter all inputs related to the rifle and sight/scope. Once
created, you can edit or delete firearms by touching and holding the name of
the firearm in the library listing. Below is a detailed list and explanation of
all the variables required on this page.
|
Profile |
|
|
Name |
This is a descriptive title you give
to the rifle/scope system that will appear in the library listing. |
|
Firearm
Data |
|
|
Barrel Twist |
How many "inches per turn"
is your rate of rifling twist. This
number is used along with other inputs to determine the stability and related
trajectory metrics. Typical value for
this input is between 1:7" and 1:13". |
|
Twist
Direction |
[Left or Right] Right refers to a
counterclockwise direction of rotation from the shooters point of view. Most barrels are right twist. |
|
Sight
Height |
how high the scope centerline is
above the bore centerline. This is
typically between 1.5" and 3.5". |
|
Sight
Offset |
the scope centerline is not directly
above the bore centerline, this input defines how much and in what
direction. Unless your scope is not
mounted right over the barrel, this input will be 0. |
|
Sight
Data |
|
|
Reticle |
Here is where you select the reticle you would like to see in the reticle
output view. |
|
Reticle True Magnification |
Second focal plane scopes have a specific
power at which the reticle scale is accurate, or
'True'. Refer to the literature for
your particular optic to find out what power the scope has to be on for the reticle to be scaled properly. Note, first focal plane scopes are 'true'
at any power. If this particular rifle
has iron sights (no scope) then these inputs don't matter. |
|
Reticle Low Magnif. |
This is the lower limit of the scopes
power range, used for scaling reticle output view. |
|
Reticle High Magnif. |
This is the upper limit of the scopes
power range, used for scaling reticle output view. |
|
Elevation
Unit |
What units does your scope adjust in:
Minutes Of Angle (MOA), Miliradians (MILS) or
Inches Per Hundred Yards (IPHY)? Most scopes
are either MOA or MIL. |
|
Elevation
Turret Grad |
What is the value of each 'click' on
the elevation turret? Usually MOA
scopes are 1/4, some are 1/8. MIL
scopes are usually 0.1 with some being 0.05. |
|
Windage Unit |
Same as elevation only for the windage knob of the scope. |
|
Windage Turret Grad |
Same as elevation only for the windage knob of the scope. |
|
Lead
Unit |
This is the units that the calculated
Lead will be displayed for moving targets.
Typically you want this to correspond to a reticle
feature (MIL dots for example). |
|
Elevation
Correction Factor |
These are actually very important
inputs that describes how much your reticle actually moves in response to a given
adjustment. For example, if you dial
40 MOA on your scope and it only really shifts the point of aim by 38.5 MOA,
you need to apply a correction factor
(CF) to account for this, otherwise your scope adjustments will not result in
the proper aim. Click here to visit
the Applied Ballistics calibration factor calculator to figure out how to
determine the proper CF for your scope.
If you currently don't know your scopes CF you can enter 1.0 (which
will apply no correction). However,
keep in mind that many perceived errors in ballistic predictions are actually
errors in scope calibration. This is
an important input that you should determine at your next trip to the 100
yard range. |
|
Windage
Correction Factor |
|
Hint: Determine Elevation Correction Factor
The "Tall Target Test" is a highly valuable calibration
exercise which gets you ready for long range shooting.
Simply place a 'tall target' at 100 yards or meters
and draw a plump line (using a plumb bob or level). Fire a group at the bottom of the target at
your zero, then dial the scope up 30 MOA or 10 MILS and shoot another
group. Measure the distance between the
two groups and determine how much the group actually moved in relation to the
adjustment that was made on the scope.
For example, if the groups are only 29 MOA apart when you actually
dialed 30 MOA, then the correction factor is 30/29 = 1.035.
The program will scale your calculated drop by this
correction factor to account for the error in scope travel.
The tall target test is also a good way to verify the
scope is level and tracking vertically.
After you've entered all the inputs on the rifle page,
click 'update' and this rifle will be stored in the rifle library under the
name you entered.
After you've created one or several firearms, it's time
to move on and add ammunition.
Ammo Library
In the ammo library, you have the option to Add Ammo
or view the Bullet Library. If you
select Bullet Library, it will guide you thru a process of selecting a bullet
from the programs extensive data base.
If you select 'Add Ammo', you can enter your ammo
including all bullet parameters from scratch.
Once created, you can edit,
delete, duplicate or duplicate to another firearm by pressing and holding the
ammo title in the library list. The
following explains all of the inputs required to add an ammo type.
|
Profile |
|
|
Name |
Descriptive
title that identifies this ammunition in your library. |
|
Ammunition Data |
|
|
Bullet Diameter |
[Inches] This is the bullet
caliber. For
example, .284, .308, .338, etc. |
|
Bullet Weight |
[Grains] Self explanatory. |
|
Bullet Length |
[Inches or Centimeters] This is used for stability
and related trajectory calculations including spin drift. |
|
Muzzle Velocity |
[feet per second (fps) or
meters per second (mps)] How fast the bullet leaves the rifle as measured by a
chronograph. For
very accurate results, remember to account for the velocity lost in the 10-15
feet between the muzzle and the chronograph. As a rule of thumb, a bullet looses
5-15 fps in this short distance. |
|
MV Variation |
[fps/oF or mps/oC] This
variable describes the temperature sensitivity of your ammunition in terms of
fps/degree. For example, if your MV is 3000 fps at 80 degrees, and
2980 fps at 40 degrees, the variation is 20 fps in 40 degrees, so you would
input 0.5 fps/degree. |
|
Powder Temperature |
[oF or oC]
This is the temperature of the
powder that corresponds with the Muzzle Velocity that was input. |
|
Atmosphere Standard |
[ASM or ICAO] This is the atmosphere model that you want to use. ASM (Army Standard Metro) is the old model, ICAO (International Civilian Aviation Organization) is a newer model. ICAO is the correct choice in most cases. The importance of this choice is that it should match the atmosphere model that your BC is corrected for. Only choose ASM if you're using a BC advertised by Barnes, Hornady or Sierra. All other sources of BC's including Bryan Litz's measured BC's and custom drag curves are matched to the more modern ICAO standard. |
|
Drag Model |
This program also
gives you the option of entering unlimited multiple BC's defined by velocity bands.
For Extended Long Range Shooting, the accuracy of the ballistic
solution can be improved by using a custom drag
curve instead
of a BC. When using custom
drag curves, the ballistics engine is solving the equations of motion using
the exact drag curve for a specific bullet, not referencing a standard (G1 or
G7) curve. The added accuracy in
trajectory predictions that is possible with custom drag curves is especially
valuable when shooting at targets at or beyond transonic range, because
that's the speed region where drag curves tend to diverge most (see Mach vs CD plot to the right).
If you're only shooting to ranges at which the bullet never
slows below 1340 fps, little to no improvement can be expected for trajectory
predictions compared to using G7 BC's.
For further reading on this subject, refer to Chapter 11: Extended Long Range Shooting of Applied Ballistics for Long Range Shooting. Custom drag curves are available for many bullets as in-app purchases. Curves will be added to expand the library based on user request. |
|
Zero Data |
|
|
Zero range |
[Yards or Meters] This is the range at which
your rifles Point Of Aim (POI) equals the Point Of Impact (POI). A Zero range of 100 yards or meters is
encouraged for several reasons, including insensitivity to atmospheric
conditions, and accounting for inclined fire effects. |
|
Zero Height |
[Inches or Centimeters] If your POA does not exactly equal your POI at the zero range, you
can enter how much the group is off center. In other words if you have 1/4 MOA
clicks on a scope and the zero is 0.1" high, you can enter this here to
account for the error that's less than 1 click. |
|
Zero Offset |
[Inches or Centimeters] Same as above for the
horizontal direction; use a negative value to indicate left. |
|
Enable Zero Atmosphere |
[Checkbox] If you use a longer range zero for
your rifle, 600 yards for example, that zero will be subject to changes in
atmospherics. This feature
allows you to compensate for that those effects by entering the atmospherics
that apply to your zero conditions.. If
you use a 100 yard/meter zero, the impact shift will be too little to worry
about in different environments, so you can ignore this feature (leave
unchecked) if you have a 100 yard/meter zero. |
|
Altitude, Barometric Pressure, Pressure is absolute, Temperature
and Humidity |
Inputs are all treated the same as the environmental inputs
which are described below. |
Environment
Having built the Rifle and
Ammo libraries ahead of time, the environment screen is where you will spend most
of the time when using this program in the field. This is where you enter variables
related to the target, atmosphere, and optional effects like spin drift and
Coriolis.
|
Target |
|
|
Distance |
[Yards or Meters] This is the range to the target in yards
or meters, and is probably the most critical input of the entire program. Estimated distances result in
predictions that are no more accurate than the estimation. Entering accurate range values
becomes increasingly important at longer ranges where the trajectory is
falling off the fastest. Use
a laser rangefinder to determine range whenever possible. |
|
Look
Angle |
[Degrees] Also known as inclination angle, this is the uphill or
downhill angle to your target and is measured with an inclinometer (angle
indicator). Many
mobile devices have inclinometers built in, and you can use it to populate
the look angle field by going to menu and selecting get look angle. The value will be positive for
look-up angles, and negative for look-down angles. Small look angles, like less than 5
degrees can typically be ignored with little consequence even for long range
shooting. If the angle
exceeds 10 degrees it becomes increasingly important to account for. |
|
Move
Speed |
[mph or mps] If the target is moving, this input is the speed of the
target. |
|
Move
Angle |
The
direction of a target moving: ·
toward you is 0 degrees or 12 O'clock. ·
right to left is 90 degrees, or 3 O'clock. ·
away from you
is 180 degrees, or 6 O'clock. ·
left to right
is 270 degrees, or 9 O'clock. See picture to the right for clarification on the directions. |
|
Atmosphere |
|
|
Barometric pressure is also known
as sea level corrected pressure, and is what the weather station and airports
report because it's useful for pilots and making weather
assessments. Barometric pressure is not the actual air pressure
where you are, rather it's a number that's corrected to sea
level. In order to determine the actual air pressure where you are
(which is what the ballistics program cares about), you have to account for
the effects of altitude. However if you have a handheld weather
meter like a Kestrel, you can measure Station Pressure directly
which is the actual air pressure where you are. This is the
preferred method of inputting pressure data because it's one less input and
relies on only one measurement instead of two. A common error is to mistake
station pressure for barometric or vice versa. The consequence of
this error is that the wrong air density gets applied which degrades the
accuracy of trajectory predictions. This error is increasingly
more severe the higher up you are above sea level. Refer to the image on the right for
proper set-up of the atmospheric pressure inputs. Note the reference altitude is set to 0 ft
in the Kestrel which indicates it's displaying uncorrected station pressure,
and the Pressure is Absolute box is
checked in the program indicating it's using station pressure. To further clarify the output from
the Kestrel, here is an excerpt from the Kestrel user's manual: "Some final notes - If you wish to know the actual or
station pressure for your location (such as for engine tuning), simply set the reference altitude on the BARO
screen to “0”. In this case, the
Kestrel Meter will not make any adjustment and will display the measured
value. (Engine tuning and ballistics software sometimes refer to atmospheric or station pressure as “absolute
pressure.” These applications are concerned with the actual air density, as opposed to
pressure gradients relating to weather, so barometric pressure is less useful." |
|
|
Altitude |
This
is your altitude above sea level and is only used if you're working with
barometric pressure. |
|
Barometric
Pressure (or
Station Pressure) |
If using altitude, input Barometric pressure. If not using altitude, enter measured
station pressure at your location (see above discussion under Atmosphere). |
|
Pressure
is Absolute |
[Checkbox] If checked, it means you're entering
station pressure as measured by a Kestrel (or similar device). If unchecked, then you're working
with altitude and barometric pressure. |
|
Temperature |
This
is the air temperature thru which the bullet flies. |
|
Humidity |
Relative
Humidity in %. This
is not a highly important variable, if unknown enter 50%. |
|
Wind
Speed |
Enter the speed of the wind. |
|
Wind
Angle |
The angle/direction of a wind is named for where the wind comes from, and you can enter this in either degrees or clock direction. For example, a wind blowing from right to left is a 3 O'clock, or 90 degree wind. A tail wind is a 6 O'clock or 180 degree wind, etc. |
|
Spin
Drift |
|
|
Enable |
[Checkbox] Spin drift, aka gyroscopic drift is a minor effect that can be considered optional in a ballistic solution. If you've given the program accurate inputs related to the bullets stability, it will compute spin drift accurately, but it usually amounts to less than 10" at 1000 yards. The effect is aerodynamic, and arises from the fact that the bullet is spinning. Direction of spin drift is the same as barrel twist, and is in the horizontal plane only. |
|
Coriolis |
|
|
Enable |
[Checkbox] Coriolis Effect refers to the very small drift of a trajectory that arises from the spin of the earth. There is both a vertical and horizontal component of Coriolis. The vertical component depends on latitude and azimuth of fire. Firing east will cause the bullet to strike low, and firing west will cause you to hit high. Firing north or south will not result in any deflection. The horizontal component depends entirely on latitude, with the deflection always being to the right in the northern hemisphere and to the left in the southern hemisphere. Both components are more severe the further you are away from the equator. |
|
Latitude |
How far you are from the equator (south of the equator is noted with -). Tip, most of the lower 48 states of the US lay between 30 and 45 degrees North Latitude. |
|
Azimuth |
Direction of fire in degrees, clockwise from north. For example, firing due east is 90 degrees, south is 180 degrees, west is 270 degrees, and north is 0 or 360 degrees. You can access the get target azimuth function via the mobile devices built in compass via the menu. |
Output
The usefulness of a ballistics app is not limited to putting out an accurate, numeric windage and elevation correction. A truly user friendly ballistics app will display outputs in a convenient form that a user can apply quickly and easily while minimizing the chance of mistakes. The following sections will review the various forms of output available from the Applied Ballistics Mobile App.
Single Shot HUD
View
The Single Shot HUD View is the simplest form of output. This display mode simply shows the windage, elevation, and lead as a numeric adjustment in either MOA or MILS.
Single Shot Reticle View
The reticle view is available for those shooters who prefer to hold their correction in a scope reticle rather than dial the correction on the scope turrets. The reticle view accounts for scope magnification effects. So you can see where to hold in the reticle no matter what the scope power setting is in both first and second focal plane optics. The reticle view also allows for 'dialing on' elevation in the event you need to hold more than the reticle allows. For example, if you need 40 MOA of total elevation, but you can only hold 30 MOA in the retical, you can 'dial on' 30 MOA and hold 10 MOA. The reticle view is very useful for augmenting the effectiveness of ballistic reticles which are based on certain environmental conditions, MV and BC's. Using the AB Mobile app reticle view, you can use a get a perfect hold for any ballistic reticle, even when you're off condition.
|
Single Shot Reticle
View with MIL dot reticle |
Reticle View with +5 MILs 'dialed on' |
|
|
|
Trajectory Table
The trajectory table output view simply shows tabulated output that is user format-able via the preferences. You can see your elevation, windage, time of flight, etc in 1 to 100 yard increments. The range at which the bullet goes subsonic is indicated with a red cell.
|
Table output view with 100 yard increment |
Table output view with 25 yard increment |
|
|
|
Trajectory Reticle
The trajectory reticle view has two basic options, selectable in the main preferences page. You can either see a hold every 100 yards/meters, or see what range corresponds to each reticle sub tension. In either viewing mode, you can adjust magnification and/or 'dial on' elevation and the reticle view will dynamically respond.
|
Indicate hold every 100 yards |
Indicate range at each sub tension |
|
|
|
|
Magnification
zoomed to 22X |
With +5
MILs 'dialed on' |
|
|
|
Trajectory Graph
The trajectory graph view shows the ballistic curve, along with velocity.
|
Trajectory Graph output view |
|
|
Ballistic
Calibration
The ballistic calibration feature allows a user to calibrate the ballistic solution based on observed bullet drop at range. There are 3 parameters that can be calibrated; muzzle velocity, [bullet] drag, and by directly scaling the amount of drop. The Ballistic Calibration tool is accessed via the main menu from any solution screen.
|
Ballistic
Calibration Interface |
|
|
Due to light sensitivities and uncertainties involved with modern chronographs, velocity measurements are not always as accurate as we would hope. Therefore the first variable a shooter should attempt to calibrate is muzzle velocity. The muzzle velocity calibration should be done at a great enough distance that the amount of drop is great, meaning at least 20 MOA or 7 MILS. If you have multiple 'observed' data points, use the farthest high confidence data point available for muzzle velocity calibration. The interface will state the optimal range in which to calibrate muzzle velocity based on the bullets remaining velocity. After you've entered the observed range/drop pair, hit calibrate and the program will calculate and display the actual MV that results in your observed drop. Click 'Apply Calibration' and the calculated MV will be saved in the ammo library and future ballistic calculations will be based on this value.
The drag calibration feature can be used to adjust the drag model used for a particular bullet, weather you're using a BC or custom drag table. The drag calibration feature is applied after the muzzle velocity calibration, thru the transonic range of the bullet flight. Note that if the observed points require more than 50% adjustment in the original drag of the bullet, the program will not allow it due to the extreme (non-physical) nature of the physics. In other words, if you're trying to scale drag by more than 50% to match your observed drop point, it's likely that the points are not accurate, or were influenced by wind or something else. The primary intent of the drag calibration is for shooting into the transonic zone where various levels of dynamic instabilities can occur, and affect the drag of the bullet differently over various range segments.
The drop calibration feature is intended to compensate for errors in scope tracking. This mode is different from muzzle velocity and drag scaling in that the calibration is only applied to the drop number. The calculated remaining velocity, time of flight, wind, lead, etc all remain based off the original BC and velocity inputs. In other words, the physical solution is not affected in this mode, only the drop. The drop calibration is applied in the region of bullet flight beyond transonic, which is typically at ranges far beyond where most shooters will be able to shoot.
Preferences
The preferences are accessed from the main (first) entry screen to the AB app. This is where you set all the options and settings for the program. Below are screenshots showing all the preferences you have access to.
|
Preferences page 1 |
Preferences page 2 |
Preferences page 3 |
Preferences page 4 |
|
|
|
|
|
Web Sync
The web sync feature allows a user to back up rifle and ammo libraries online. You can sync profiles either from your device to the web, or from the web to your device. This feature is very useful in the event your mobile device is lost or crashes, your valuable information is backed up and always accessible via your online profile.