Magnetic Variation

The Magnetic Variation is used to calculate Magnetic Headings or Bearings from True Headings or Bearings and vice versa.

OziExplorer has 3 methods of obtaining the Magnetic Variation.

1. It can be manually entered for each map in the Calibration screen, this is optional.
2. It can be obtained from the GPS when connected and actively doing real time tracking
3. It can be calculated by OziExplorer for any position on the globe for any given point in time.

Which Magnetic Variation is used

When calculating bearings for "Routes" and "Distance between waypoints (bearings)" the manually entered Magnetic Variation is used, if this has not been entered the calculated Magnetic Variation is used.

When displaying a route for navigation but the GPS is not active then the manually entered Magnetic Variation is used, if this has not been entered the calculated Magnetic Variation is used.

When displaying a route for navigation and the GPS is active and is transmitting the Magnetic Variation or Magnetic Course then this reading is used, if the reading is not available then the manually entered Magnetic Variation is used, if this has not been entered the calculated Magnetic Variation is used.