Compass

The ROV compass system is designed to display headings relative to Magnetic North. You can enter a local compass variation to account for magnetic declination. The declination is considered positive when the Magnetic North is East of True North.

The value you enter is numerically added to the heading from the ROV. For example, if you are in an area with a declination of 15 degrees West, the ROV heading will read +15 degrees when the ROV is facing True North (assuming no variation has been entered). You should therefore enter -15 for the variation, which would result in a correct True North reading of 0 when the ROV is pointed True North.

The declination is saved from session to session. Be sure to clear it or change it at the start of each session if necessary.

You can enter a compass variation to facilitate easier navigation with respect to a fixed reference such as a dock. If you know the heading of the dock, you can enter the negative of that heading as a variation and the compass will indicate North when you are aligned with the dock. East would indicate a course that is toward the right, either perpendicularly towards or away from the dock depending if you were on the left or right respectively.