Name: TruFlite Ballistic Calculator
Rating: 4.3 (115 reviews)
Author: jrjackson

TruFlite is an exterior ballistics program for long range shooting.  It contains a fast and accurate stand alone ballistics engine.  Elevation and Windage corrections can be in MOA, Mils, cm, inches or clicks.  All values can be set for metric or imperial units.  The Free version only allows use of the first profile (gun and load information).  Profiles are pre-populated with example values and should be changed to match your rifle/cartridge specifics.  When calculating a firing solution, TruFlite uses the current Ambient (Station) Barometric Pressure from the device's raw sensor in order to provide the most accurate solution for your current environment. 

Basic Navigation:
UP - cycles through field environment variables:   Range, Wind Speed, Wind Direction, Temperature, Slope (Line of Sight), Azimuth (Direction of Fire)
ENTER/OK - allows changing the currently displayed field variable
MENU - allows changing options, units and profile information
BACK - will go back to previous screen, cancel current edit or exit TruFlite
DOWN - brings up Quick Menu for accessing Range Card and PRS Card (Pro only)

Different Garmin devices have different buttons and/or touch gestures for the above operations (see your device manual if needed).

You can also change options or profile (gun and cartridge) information via your phone using the Garmin Connect IQ App: TruFlite Settings.

Pro Version: For $20 USD you can upgrade and unlock the following features:
   Multiple (7) Gun/Ammo Profiles
   Advanced Trajectory Calculations (Spin Drift, Aerodynamic Jump, Coriolis)
   Zero Offset
   Range Card
   Multi-Range (PRS) Card 
   Component/Detail View

To upgrade send an email to jeffrjackson@frontier.com or use the "Contact Developer" link (be sure and include your email address).
Questions or comments please use "Contact Developer" link.

FAQ:  https://drive.google.com/file/d/1PjywQYhWbfkEFq0ZNZH4QhaSFMJlkE1V/view?usp=sharing

More Infomation here:  https://forums.garmin.com/developer/connect-iq/f/showcase/6765/watch-app-truflite-ballistics