Garmin GPSMAP 3006C Installation Instructions Manual page 17

I I
NSTALLATION NSTRUCTIONS
Flush Mount Drilling Template
Drill using a
11/64" (4.5 mm)
drill bit
Drill this 3/4" (19 mm)
hole if the coax is
going to be installed
through the mounting
panel.
GPSMAP 3006C/3010C & GPS 17 15