My Garmin 195 does not work if the antenna is near my Narco MK12D
radio when the radio is tuned to certain frequencies (like 119.3, my
home base's tower freq). Some have speculated that the display in the
radio interferes with the GPS. You may have similiar interference
problems...

Rob Wren PP-ASEL-IA
1961 C -182D N8875X
KVNY