JRC JLR-21 Instruction Manual page 27

● 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.
Mounting base
GPS3
Flat washer
Spring washer
Nut (M8)
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
GPS2
BOW
GPS1
Fix horizontally
to the keel line
Nut
Spring washer
Flat washer
Flat washer
Fixing bracket
Spring washer
Hex bolt
Hex bolt (M8)
Flat washer
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