Scanner Installation

The following section covers the installation and setup of the GMR 20 (2 kW) and GMR 40 (4 kW) Marine Radars. The GMR 20 and 40 only operate with components of the Garmin Marine Network with compatible MFD (Mulit-Function Displays). See your Garmin dealer or the Garmin web site for more details. To complete the installation, you will need the appropriate fasteners, tools, and mounts. These items should be available at most marine dealers. Always wear safety goggles, ear protection, and a dust mask when drilling, cutting, or sanding. When drilling or cutting, always check first to see what is on the other side of the surface. When in doubt, seek professional assistance.

Installation Guidelines

In order to maximize the performance of the radar, please observe the following installation guidelines:

•An ideal scanner mounting location is high above the ship’s keel line with a minimal part of the vessel’s structure or rigging blocking the radar beam. Obstructions in the path of the radar beam may cause blind/shadow sectors or generate false echoes. The higher the installation position, the further the scanner can detect targets.

•Avoid mounting the scanner on the same level as smoke stacks or horizontal spreaders/crosstrees on a mast. Do not install the scanner near heat sources where it may be subjected to smoke or hot air from smoke stacks or heat from lights.

•The mounting surface/platform should be sturdy enough to support the weight of the scanner (26 lbs.), flat as possible, and parallel with the vessel’s water line.

•It is recommended that the radar scanner is mounted out of range of personnel (horizontial beam width above head height). Do not look directly at the antenna at close range as your eyes are the most sensitive part of the body to electromagnetic energy. When properly installed and operated, the use of this radar will conform to the requirements of ANSI/IEEE C95.1-1992 Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields.

12.5°

12.5°

Ideal Radiation Plane

12.5°

12.5°

Ideal Radiation Plane

•Mount other electronics and cables more than 2 m (7 ft) from the path of a radar beam. A radar beam can normally be assumed to spread 25° vertically above and below the scanner’s radiating element. For vessel’s with higher bow angles at cruise speed, it may be helpful to lower the angle so the beam points slightly downwards to the waterline while at rest. Shims may be used as necessary.

•Install the scanner away from antennas for other electronics. GPS antennas should be either above or below the radar beam path of the scanner. Mount at least 1 m (3 ft) from any equipment transmitting or cables carrying radio signals e.g. VHF radios, cables and antennas. In the case of SSB radios, the distance should be increased to 2 m (7 ft). IEC 60936-1 clause 3-27.1 maximum distances from the antenna at which RF (Radio Frequency) levels can be expected.

GMR20 (100W/m squared = 40cm [15.75”]) (10W/m squared = 120cm [47.24”]) GMR40 (100W/m squared = 60cm [23.62”]) (10W/m squared = 175cm [68.90”])

•The radar scanner transmits electromagnetic energy. It is important that the radar is turned off and/or DC power input be disconnected whenever personnel are required to come close to the scanner to perform work on the scanner assembly or associated equipment.

Installation

The following order of mounting the scanner and attaching the Power/Network cables may vary depending on the installation location and mount used.

GMR 20/40 Radar Installation Manual

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