Had this same thing. Sent unit down to Action Water Sports in AZ as the software expired internally and manufacturer had no idea. Anyway, he re-flashed it for 100 bucks and all good. Sorry so late on response.
Thanks all! Mostly Mead and Mojave. Thinking taking the ATV and boat to Sand Hollow to do a combo weekend. Thoughts on any who have done this? Great info on here so thanks to all contributors.