Garmin GMR 18 HD3 Installation Instructions Manual Download 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.

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  .

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.

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

Summary of Contents for GMR 18 HD3

Page 1: ...re or overheating the appropriate fuse must be in place as indicated in the product specifications Connecting the power cable without the appropriate fuse in place voids the product warranty CAUTION F...

Page 2: ...Tools Needed Drill 9 5 mm 3 8 in drill bit 32 mm 1 1 4 in drill bit optional 4 mm 5 32 in hex wrench 13 mm 1 2 in wrench and torque wrench Marine sealant 2...

Page 3: ...roof you may need to install a raiser so the roof does not interfere with the radar signal Roof Mounting Considerations page 5 The radar should be mounted on a flat surface or a platform that is paral...

Page 4: ...istance value listed in the product specifications Other electronics and cables should be mounted more than 2 m 6 ft from the radar beam path GPS antennas should be either above or below the radar bea...

Page 5: ...d a negative impact on performance Mounting the radar directly on a hard top could cause the transmitted energy to be reflected or absorbed by the surface If the surface is metal this is particularly...

Page 6: ...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 i...

Page 7: ...he guide grooves on the bottom of the case and secure them using a cable hold down plate The cables should be bent or twisted as little as possible 4 Using the arrow on the bottom as a reference posit...

Page 8: ...ar moving objects and high heat sources or through doorways and bilges To avoid interference with other equipment you should not run network and power cables parallel to other cables such as radio ant...

Page 9: ...in network cable with larger connectors To connect this radar to an older device with a larger connector you can use the included adapter This radar provides data to a connected chartplotter When the...

Page 10: ...ce or on the Garmin network The network cable may not be connected correctly to the device or to the Garmin network Check all connections If a field installable network connector was used it may have...

Page 11: ...am width GMR 18 HD3 and GMR 18 xHD3 5 2 degrees horizontal 25 vertical GMR 24 xHD3 3 7 degrees horizontal 25 vertical Maximum range GMR 18 HD3 36 nm GMR 18 xHD3 and GMR 24 xHD3 48 nm Minimum range 20...

Page 12: ...Detailed Dimensions Item GMR 18 24 xHD3 GMR 24 xHD3 Length 508 2 mm 20 in 645 4 mm 25 7 16 in width 504 7 mm 19 7 8 in 642 5 mm 25 5 16 in height 248 3 mm 9 in 250 3 mm 9 7 8 in 12...

Page 13: ...5 9 16 in 141 5 mm 5 9 16 in 190 mm 7 in 258 5 mm 10 3 16 in 139 2 mm 5 in 207 7 mm 8 3 16 in 141 5 mm 5 9 16 in 141 5 mm 5 9 16 in 227 5 mm 8 15 16 in 296 2 mm 9 11 16 in Open Source Software Licens...

Page 14: ...ries registered in the USA and other countries GMR is a trademark of Garmin Ltd or its subsidiaries These trademarks may not be used without the express permission of Garmin NMEA NMEA 2000 and the NME...

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