I'm having the same problem. But over the weekend, I experimented by moving
the unit farther from the VHF radio antenna. That fixed the problem. If you
can't move it, you may experiment by wrapping a short length of metal
screening--perhaps 12"-- over the a portion of the VHF antenna near the Garmin.


That should not crimp VHF reception significantly.
Joel Albert
Potomac, MD
))