Garmin GMR 18 HD3 Installation Instructions Manual page 6

Determining the Radar Mounting Height
If you plan to install the radar on a roof or hard top, you should install it high enough to avoid interference from
the surface.
1 Based on the shape of the roof, complete an action:
• Measure the distance from the intended mounting location to the furthest front corner of a rectangular
roof .
• Measure the distance from the intended mounting location to the front apex of a curved roof
2 Use this equation to determine the mounting height of the radar based on the distance you measured in the
previous step:
(Distance (mm)
(Distance (in.) × 0.222) - 6 = height (in.)
For example, if the mounting location is 2 m (6.6 ft.) from the corner of the roof, this is how you would
complete the equation to determine the mounting height after converting to mm (or in.):
(2000 mm × 0.222) - 150 = 294 mm
(78 in. × 0.222) - 6 = 11.3 in.
3 Install a riser or other fixture so the base of the radar is equal to or higher than the distance you calculated in
the previous step.
6
× 0.222) - 150 = height (mm)
NOTICE
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