Garmin GMR 18 HD3 Installation Instructions - Page 6

Determining the Radar Mounting Height NOTICE 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) × 0.222) - 150 = height (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