Enter the gyro heading read at each compass heading. Deviation = magnetic heading − compass heading (East +, West −). Everything saves automatically on this device.
Vessel and compass
Position at the time of observation
Latitude
°'
Longitude
°'
Variation, gyro error and limit
Variation at position (degrees)
Gyro compass error (degrees)
True heading = gyro heading + gyro error. Magnetic heading = true heading − variation. East is +, West is −.
Readings
| Compass heading | Gyro heading | Deviation | Status |
|---|
Correctors on the binnacle (as found)
Pick the number of magnets first, then the slot and the direction of the red end for each one. Use n/a where nothing is fitted. The Adjustment page reads these choices.
Conditions and sign-off
Enter the date, UTC time and position, pick the object from the sky view, then enter the readings you took at the same moment. The app works out the true bearing and the errors.
Observation
Time (UTC)
Latitude
Longitude
Sky view
Readings
Variation