GARMIN HD3 Radar Dome Marine Instruction Manual

GMR™ 18 HD3 AND 18/24 XHD3
INSTALLATION INSTRUCTIONS

Important Safety Information

WARNING
See the Important Safety and Product Information guide in the product box for product warnings and other important information.
Failure to install this device according to these instructions could result in personal injury, damage to the vessel or device, or poor product performance.
The radar transmits electromagnetic energy. To avoid possible personal injury, damage to the vessel or device, or poor product performance, ensure that the radar is installed according to the recommendations in these instructions and that all personnel are clear of the path of the radar beam before transmitting. When properly installed and operated, the use of this radar conforms to the requirements of ANSI/IEEE C95.1-1992 Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields.
To avoid possible personal injury, do not look directly at the antenna at close range when the radar is transmitting. Eyes are the most sensitive part of the body to electromagnetic energy.
When connecting the power cable, do not remove the in-line fuse holder. To prevent the possibility of injury or product damage caused by fire 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
For the best possible performance and to avoid potential injury, damage to the device, or damage to your vessel, installation by a qualified marine installer is recommended.
Opening the device may result in personal injury and/or damage to the device. This device contains no userserviceable parts, and should be opened only by a Garmin® authorized service technician. Any damage resulting from opening the unit by anyone other than a Garmin authorized service technician will not be covered by the Garmin warranty.
This device should be used only as a navigational aid. Using the device for any purpose requiring precise measurement or direction, distance, location, or topography may result in personal injury or damage to the vessel.
To avoid possible personal injury, always wear safety goggles, ear protection, and a dust mask when drilling, cutting, or sanding.
NOTICE
When drilling or cutting, always check what is on the opposite side of the surface to avoid damaging the vessel.

Software Update
You must update the Garmin chartplotter software when you install this device. For instructions on updating the software, see your chartplotter owner’s manual at support.garmin.com.

June 2023
GUID-0436BE40-091E-49FE-9005-E50CFCABE751 v1

Tools Needed

• Drill
• 9.5 mm (3 /8 in.) drill bit
• 32 mm (1  /4 in.) drill bit (optional)
• 4 mm (1 5 /32 in.) hex wrench
• 13 mm (1 /2 in.) wrench and torque wrench
•  Marine sealant

Mounting Considerations

To complete the installation, you need the appropriate fasteners, tools, and mounts. These items are available at most marine dealers.
When selecting a mounting location, observe these considerations.

WARNING
You must mount the radar out of range of people, with the vertical beam width above head height. To avoid exposure to harmful radio frequency (RF) levels, you must not mount the radar closer to people than the minimum safe distance value listed in the product specifications.

• You should mount the radar high above the ship’s keel line with minimal blockage between the vessel and the radar beam. Obstructions may cause blind and shadow sectors, or generate false echoes. The higher the installation position, the farther the radome can detect targets.
• If you are mounting the radar on a cabin 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 parallel to the vessel’s water line and is sturdy enough to support the radar’s weight. The weight for each model is listed in the product specifications.
• The radar must be mounted in a location where it can be connected to power and the Garmin network (Wiring and Connection Considerations, page 8).
• Most radar beams spread vertically 12.5 degrees above 1 and 12.5 degrees below 2 the radome’s radiating element. On vessels with higher bow angles at cruise speed, the installation angle can be lowered to point the beam slightly downward to the waterline while at rest. Use shims if necessary.

• The radome has two mounting options when installed on a standard marine mount. One mounting option is closer to the center of the radome 3 , and the second option is offset towards the back 4 to move the radar further away from the mast.

• The radar should be mounted away from heat sources such as smoke stacks and lights.
• The radar should be mounted at a different level than horizontal spreaders and mast crosstrees.
• To avoid interference with a magnetic compass, the radar should not be mounted closer to a compass than the compass-safe distance value listed in the product specifications.
• Other electronics and cables should be mounted more than 2 m (6 ½ ft.) from the radar beam path.
• GPS antennas should be either above or below the radar beam path.
• The radar should be mounted at least 1 m (40 in.) from any transmitting equipment.
• The radar should be mounted at least 1 m (40 in.) away from cables carrying radio signals such as VHF radios, cables, and antennas.
• The radar should be mounted at least 2 m (6.5 ft.) away from Single Side Band (SSB) radios.

Roof Mounting Considerations

NOTICE
If you are mounting the radar on a roof or hard top of your boat, you may need to raise the installation height using a pedestal or other suitable structure to avoid 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 important to avoid.
The beam transmitted by this radar spreads vertically 12.5 degrees from the horizontal mid line 1 , and you should raise the dome 2 so the beam clears the edge of the roof or hard top 3.

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 1.
   • Measure the distance from the intended mounting location to the front apex of a curved roof 2.

2. Use this equation to determine the mounting height of the radar based on the distance you measured in the previous step:
   (Distance (mm) 3 × 0.222) – 150 = height (mm) 4
   (Distance (in.) 3 × 0.222) – 6 = height (in.)  4
   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.

Mounting the Radar

Before you mount the radar, you must review the mounting location considerations and select a mounting location.
NOTE: The supplied M8 x 1.25 x 60 threaded rods can be used on mounting thicknesses of 5 to 30 mm (3/16 to 1 3/16 in.) (recommended). For surfaces over 30 mm (1 3/16 in.), use longer threaded rods.

1. If you are not installing the device on a pre-drilled Garmin compatible radar mount, use the included mounting template to drill four 9.5 mm (⅜ in.) mounting holes.

2. Connect the power cable to the power port 1 and the network cable to the network port 2 .
   

3. Press the cables into any of the guide grooves 3 on the bottom of the case, and secure them using a cable hold-down plate 4.
   The cables should be bent or twisted as little as possible.

4.  Using the arrow on the bottom as a reference, position the radome on the mounting surface aligned to the front of the vessel.
   NOTE: If you choose not to align the dome with the front of the vessel, you can adjust the front-of-boat offset after the dome is installed (Measuring and Setting the Front-of-Boat Offset, page 9).

5.  Apply the included anti-seize compound to the threads of the four M8 x 1.25 x 60 threaded rods.

6.  Insert the four threaded rods into the mounting holes on the bottom of the radome.
   Up to 50 mm (2 in.) of the threaded rods may extend below the radome.

7.  Apply a bead of marine sealant on the mounting surface around each mounting hole.

8. Fasten the radome  5 to the mounting surface  6 using the threaded rods 7 , flat washers 8 , spring washers 9 , and hex nuts 10.

9. Using a torque wrench, tighten the nuts to 13.7 to 18.6 N-m (10 to 14 lbf-ft.).

Wiring and Connection Considerations

It may be necessary to drill 32 mm (1 ¼ in.) holes for routing the cables.
You must apply marine sealant to the hole after the cables are in place to ensure a waterproof seal. If you must make the routing hole in a visible location, 32 mm (1 ¼  in.) decorative cable grommets can be purchased from your local Garmin dealer, or you can go to buy.garmin.com (optional).

• If needed, you can trim the grommet to enable you to route multiple cables through the same hole.
• The optional grommet does NOT provide a waterproof seal. You must apply marine sealant to the grommet after the cables are in place to ensure a waterproof seal.

When installing the cables, you should observe these considerations.

• To ensure safety, appropriate tie-wraps, fasteners, and sealant should be used to secure the cable along the route and through any bulkheads or the deck.
•  You should not run cables near 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 antenna lines or power cables. If this is not possible, the cables should be shielded with metal conduit or a form of EMI shielding.
•  You should install the power cable as close to the battery source as possible.
  ◦ If it is necessary to extend the power cable, you must use the appropriate wire gauge (Power Cable Extensions, page 9).
  ◦ Incorrectly extended runs of cable may cause the radar to malfunction due to insufficient power transmission.

Connecting the Power Cable

WARNING
When connecting the power cable, do not remove the in-line fuse holder. To prevent the possibility of injury or product damage caused by fire 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.

1. Route the power cable from the device to the power source.
2. Connect the red wire to the positive (+) battery terminal, and connect the black wire to the negative (-) battery terminal.
3.  If you have not already done so, connect the power cable to the device by turning the locking ring clockwise.

Power Cable Extensions
Connecting the power cable directly to the battery is recommended. If it is necessary to extend the cable, the appropriate gauge of wire must be used for the length of the extension.

Garmin Network Considerations

This radar connects to compatible Garmin devices to share radar data. When connecting this radar to a Garmin network device, observe these considerations.
There are two sizes of Garmin network cable connectors that may be used on various devices in your system.

• The smaller network connectors are present on many newer Garmin devices.
  ◦ These connectors are similar in size and shape to a NMEA 2000® network connector, but the pins and keys are different and do not allow you to connect to a NMEA 2000 network.
  ◦ You can connect devices with the smaller network connectors to one another using a Garmin network cable with smaller connectors.
  ◦ This radar has a smaller Garmin network connector and is packaged with a cable that has smaller connectors on both ends.

•  The larger network connectors are present on most older Garmin devices.
  ◦ These connectors look similar to traditional RJ45 network connectors.
  ◦ You can connect devices with the larger network connectors to one another using a Garmin 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 chartplotter is connected to other Garmin network devices, it shares the radar data over the network with all of the compatible connected devices.
Additional Garmin network cables, cable extensions, and adapters are available from your Garmin dealer, or go to buy.garmin.com.

Radar Operation
All functions of this radar are controlled with your Garmin chartplotter. See the Radar section of your chartplotter’s owner’s manual for operating instructions. To download the latest manual, go to support.garmin.com/manuals.
If you have more than one radar on your boat, you must be viewing the radar screen for the radar you want to configure.

Measuring and Setting the Front-of-Boat Offset
The front-of-boat offset compensates for the physical orientation of the radar scanner on a boat, if the radar scanner does not align with the bow-stern axis. The front-of-boat offset setting configured for use in one radar mode is applied to every other radar mode and to the radar overlay.

1. Using a magnetic compass, take an optical bearing of a stationary target located within viewable range.
2.  Measure the target bearing on the radar.
3. If the bearing deviation is more than +/- 1 degree, set the front-of-boat offset.
4.  From a radar screen, select Options > Radar Setup > Installation > Front of Boat.
5. Select Up or Down to adjust the offset.

Installation Troubleshooting

not be connected correctly to the device or to the battery.
Check all connections.
• The inline fuse may have blown. Check the fuse and replace it if necessary.
• The wire gauge used to extend the power cable may be too small for the length of the extension. Check the table provided in the Power Cable Extensions section of these instructions to make sure the correct wire gauge is used (Power Cable Extensions, page 9).
The radar is not available on the Garmin device or on devices connected to the Garmin network.| • The radar may not be powering on. Check the status LED.
• The device software may not be up-to-date. Update the software on the device 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 been installed improperly. Check the connector.

The status LED is located on the product label, and can help troubleshoot installation problems.

briefly and change to flashing green.
Flashing green| The radar is operating properly.
Flashing orange| The radar software is being updated.
Flashing red| The radar has encountered an error. Contact Garmin product support for assis­ tance.

Contacting Garmin Support

• Go to support.garmin.com for help and information, such as product manuals, frequently asked questions, videos, and customer support.
• In the USA, call 913-397-8200 or 1-800-800-1020.
• In the UK, call 0808 238 0000.
• In Europe, call +44 (0) 870 850 1241.

Specifications

GMR 24 xHD3: 8.7 kg (19.2 lb.)
Temperature range| From -25 to 70°C (from -13 to 158°F)
Case material| Thermoplastic resin
Water rating| IEC 60529 IPX7
Power output| 4 kW peak
Maximum antenna rotation speed| GMR 18 HD3: 24 RPM
GMR 18 xHD3 and GMR 24 xHD3: up to 60 RPM
Beam 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 m (66 ft.)
Input voltage| From 11 to 32 Vdc
Fuse| 7.5 A
Power consumption (typical)| Standby: 15 W
Transmitting: 40 W
Compass-safe distance| GMR 18 HD3: 1.2 m (3.9 ft.)
GMR 18 xHD3: 1.1 m (3.6 ft.)
GMR 24 xHD3: 95 cm (3.1 ft)

1. The device withstands incidental exposure to water of up to 1 m for up to 30 min. For more information, go to www.garmin.com/waterrating.

Detailed Dimensions

Open-Source Software License
To view the open-source software license(s) used in this product, go to developer.garmin.com/open-source/linux/.

© 2023 Garmin Ltd. or its subsidiaries
Garmin® and the Garmin logo are trademarks of Garmin Ltd. or its subsidiaries, 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 NMEA 2000 logo are registered trademarks of the National Marine Electronics Association. M/N: A04676 / B04676 / C04676 IC: 1792A-04676 / 1792A-04676 / 1792A-04676

© 2023 Garmin Ltd. or its subsidiaries
support.garmin.com

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