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● Installation Procedure for Optional Mount Base for NNN-21
1. Install the mounting base to the pole by using fixing brackets, M8 bolts, flat washers, spring
washers, and nuts. Then, secure the sensor to the mounting base. Beware of the bow
direction.
BOW
GPS3
GPS1
GPS2
Nut
Hex bolt
Nut (M8)
Hex bolt (M8)
Mounting base
Spring washer
Flat washer
Flat washe
Spring washer
Pole (dockyard supply)
Steel pipe is recommended
Outside diameter: Φ60.5mm / Thickness: 5.5 mm
Outside diameter: Φ76.3mm / Thickness: 7 mm
Outside diameter: Φ89.1mm / Thickness: 7.6 mm
Flat washer
Spring washer
Flat washer
Fixing bracket
Fix horizontally
to the keel line
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