just purchased a humminbird 787c2i with nvb my question is that my gps speed bounces around real bad at any thing under 1.0 i know that they are not suppose to be that accurate less than 1.0 but i had a garmin 178c and lowrance before i purchased this unit and they read steady untill i got below
.5 mph any info would be welcome.I was wondering if it is the unit or just an
accuracy problem