【實用旅遊app】Variation|最夯免費app

Variation for the current day.

Used in navigation with a magnetic compass.

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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, WMM2015,

See: http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml

- Zoom buttons +/-

- Map types: normal and satellite

- GPS location

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/interactivity

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