AHHHH, I get what you are saying now! It makes sense. Heading sensor. Would like to see the name changed on it!

As for just verifying location, it isn't much different than the standard GPS setup in the head unit as you are still limited by how accurate the map is. As for knowing which way the boat is moving in relation to that setting, this is where the unit shines. I got you now. Took me two rereads of the post to understand what you are talking about. You are right, it wouldn't mean a hill of beans to me in relation to what I do as I am moving from point to point or staying over a ficticious spot on a map. It is however important when that ficticious spot locates an actual landmark (brushpile in this case) within a certain percentage of accuracy in relation to which side of the brushpile your boat is traveling, swinging, or swaying.

Thanks for the clarification. Makes sense now. From this day forward, I will refer to it as a "heading sensor"! Had one in my big boat years ago for autopilot which allowed for the boat to adjust course due to wind drift. Back in those day they were A LOT more expensive!