I really like and rely on my garmin 431, but when I am up in the front of the boat my garmin looses Sat signal. this only happens when my HBird 788 is on. I only use my HBird unit for DI (IT Does have gps as well) but the screen is small and I like the 431. when both units are on, my garmin freezes up, i turn off the HBird and it starts working. both are on separate battery sources. Any ideas, (other than new unit purchase)....
