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77Northstar Explorer 657 Installation and Operation Manual
18-3 Installation: The display unit
There are two mounting arrangements:
1 Flush Mounting
Requires a solid panel with access behind
for wiring and mounting screws. After flush
mounting, the display unit cannot be tilted or
moved after installation to reduce any unwanted
glare or reflections. Carefully select the best
viewing position before installation. This would
generally be in a shaded area.
1 Cut a hole in the bulkhead for the display unit
using the flush mount template.
2 Drill four holes for the mounting studs using
the flush mount template.
3 Screw the four studs into the brass inserts in
the back of the display unit.
4 Sit the display unit in place and fit the
washers and nuts to the studs.
Select a position for the display unit:
• At least 4” (100 mm) away from the compass,
at least 12” (300 mm) away from any radio
transmitter and at least 4 ft (1.2 m) away from
any antenna.
• Easy to read and operate. If possible, mount
the display unit in front of the navigator or to
the right of the navigator because the LCD
display is more readable from these positions.
2 Bracket Mounting
Requires a panel for mounting the bracket. Ensure
that the panel is not likely to deform and is not
subject to excessive vibration. The bracket can
be tilted and rotated. The display unit can be
removed when it is not in use.
1 Hold the bracket in place and mark the screw
holes.
2 Drill the screw holes and screw the bracket in
place. Do not overtighten the screws or the
display unit might not rotate.
3 Hold the display unit in place on the
mounting bracket shaft. Hand tighten the
knob on the mounting bracket.
Knob
• Not exposed to the direct sun or water and
protected from physical damage during
rough sea passages.
• Easy to access the power source and
convenient to route the transducer cables.
Mounting bracket