Rover slows down too much when making turns

ArduRover Rover 4.6
1

I have built a large Boat its 19’ with a 115hp outboard running ardurover 4.6.2. The problam im having is it slows down way to much as it turns on a WP mission. speed is set to 7.5 ms as it approches a turn at a WP it slows down to 2 or 3 ms even on a very slight turn. I have adjusted the turn radius the WP radius the max turn G and sevreal other things and nothing has any affect please give me some ideas.

2

Please post a log file with nav and contour logging enabled (see log bitmask).