Thread: Sonar Quiz #39

Originally Posted by cray

Course over ground calculated by the GPS relative to the ground

Very good guys ...

COG is determined by the unit's GPS function of comparing the present boat GPS position (Lat/Log) with the previous boat GPS position (Lat/Lon) to give direction of travel ...



This is why the Course Projection Line disappears when the boat is stationary ... Because the unit's GPS is not determining that the boat's present GPS position (Lat/Lon) is any different from the boat's previous GPS position (Lat/Lon) ...

COG can help you know which direction your boat is traveling without even without knowing your relative awareness of where you are on the Earth ...

In the above depiction ... The boat is traveling 21° from Due North (North is 0/360°) ...

Rickie