Variation v5.1
Navigational Algorithms
About this app
Developer Description
Variation for the current day. Used in navigation with a magnetic compass.
Used in navigation with a magnetic compass.
-
Variation is the angle between the magnetic and geographic meridians at any place, expressed in degrees east or west to indicate the direction of magnetic north from true north. Called MAGNETIC VARIATION when a distinction is needed to prevent possible ambiguity. Also called MAGNETIC DECLINATION. (Bowditch)
The app uses the World Magnetic Model: WMM2025.
The new model is valid from 13/11/2024 to 31/12/2029.
See: https://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml
Your last position is automatically saved.
- Storage permission is needed to save your position.
COURSE CALCULATOR
Compass and true course.
DEVIATION COEFFICIENTS
Dev = A + B SIN(Ra) + C COS(Ra) + D SIN(2Ra) + E COS(2Ra)
Calculate the coefficients A,B,C,D,E with "Magnetic compass" Windows application, (available at Navigational Algorithms website).
Enter them and save. The App will read the data and Course calculator will be able to compute the deviation.
USER INTERACE
- Zoom buttons +/-
- Map types: normal, terrain and satellite
- GPS location. ("Location" App permission must be allowed. Switch on you GPS, and then automatic location detection is possible)
Events on Map:
• Long Click: adds a mark with the variation at position for the current day.
• Tap the Mark to see the information.
• Map gestures: https://developers.google.com/maps/documentation/android-sdk/controls
What's New
World Magnetic Model 2025 valid from 13/12/2024 to 31/12/2025
Version Information
- Version
- 5.1
- Downloads
- 10K+
- Updated on
- Jul 2, 2025
- Released
- Sep 9, 2014
- Requires
- Android 5.0
Statistics
Google Play Rating History
Rating Distribution
Downloads Over Time
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Variation users say on Google Play
A Google user
Works great...! For those having trouble the app doesn't automatically prompt to allow GPS, go to ( Setting --> Apps --> Permissions ) and allow location, this worked for me.
A Google user
Good application. To those complaining about automatic location detection, allow the "location permission" to this application.
A Google user
Has a problem with permissions. Even when set manually the app doesn't give your variation at your location automatically, instead you have to select a nearby location.
A Google user
Gps not working in samsung a5
A Google user
Sony Ericsson Xperia active ST17. Android 4.04. The application crashes instantly when launched.
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