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4.8 Install a scanner on a trestle
Depending on your chosen location for the scanner, it may be easier to install the scanner if you
fabricate a trestle (or radar mast) on which you can mount the scanner.
The trestle must be sturdy and secure, and capable of supporting the scanner in all weather
conditions.
You are recommended to install the base of the trestle parallel to the water surface.
Orient the trestle so that the cable inlet on the scanner will face the stern, and so that the
scanner can be mounted at the correct angle (as discussed in the "Power boat installation"
section).
Make sure that the edges of the trestle won't trap water.
4.9 Install the 2 kW scanner unit
IMPORTANT: Remember that you must screw the bolts into place from the underside of the
location site, because the shape of the dome prevents you from installing the bolts from the
topside. Ensure that you can access the underside of the location site before drilling.
Find the paper installation template and tape it securely to the chosen location site. Before
drilling, check that
• the location site is not more than 0.6" (15 mm) thick.
• you have oriented the template correctly so that the front of the scanner unit will face the front
of the vessel.
• the location site allows the drain hole to empty.
Drill the four holes where shown to a maximum depth of 0.6" (15 mm) plus the drain hole.
Remove the template then position a rubber washer over each hole on the scanner. Ensure that
the slot in the rubber washer is aligned with the rib on the scanner.
Position the scanner carefully over the bolt holes so that they are aligned with the holes of the
rubber washers and the drill holes.
Place a spring washer then a plain washer onto each bolt, as shown. Screw each bolt into each
drill hole from the underside of the location site, and tighten securely with a 5.31" (135 mm)
torque wrench.