Garmin GPSMAP 420 Owner's Manual page 47

To mount the bracket assembly:
1. Using the swivel base as a template, mark the location of the
three holes that secure the bracket to the mounting surface.
2. Drill the mounting holes.
• If you secure the base with machine bolts, drill three
5/32" (5 mm) holes at the locations you marked.
OR
• If you secure the base with self-tapping screws, drill
starter holes at the locations you marked. Do not make
the starter holes deeper than half the screw length.
3. Secure the swivel base with three bolts or screws. DO NOT
OVERTIGHTEN.
4. Place the swivel mount bracket over the swivel base and
secure it with the short knob.
GPSMAP 400 Series Owner's Manual
®
To install the unit on the mounting bracket:
1. Align the slot on the back of the unit with the long mounting
knob, and slide the unit into place. If necessary, adjust the
long knob to spread the bracket arms apart. (Turn counter-
clockwise to widen the bracket arms and clockwise to
tighten.)
2. Adjust the unit angle, and tighten the long mounting knob
until snug.
3. Rotate the swivel mount bracket by twisting it left or right.
The bracket clicks as you turn it. Select a good viewing
angle, and then tighten all knobs.
4. Connect the power/data and transducer cables to the back of
the unit, making sure the locking rings are fully tightened on
both connectors.
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