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Mounting Location Considerations
GDT™ 43
Installation Instructions
Important Safety Information
WARNING
See the Important Safety and Product Information guide in the chartplotter or fishfinder product box for product warnings and other important information.
You are responsible for the safe and prudent operation of your vessel. Sonar is a tool that enhances your awareness of the water beneath your boat. It does not relieve you of the responsibility of observing the water around your boat as you navigate.
CAUTION
Failure to install and maintain this equipment in accordance with these instructions could result in damage or 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.
This equipment should be installed by a qualified marine installer.
To obtain the best performance and to avoid damage to your boat, you must install the Garmin® device according to these instructions.
Read all installation instructions before proceeding with the installation. If you experience difficulty during the installation, contact Garmin Product Support.
Registering Your Device
Help us better support you by completing our online registration today.
•Go to my.garmin.com/registration.
•Keep the original sales receipt, or a photocopy, in a safe place.
Garmin Support Center
Go to support.garmin.com for help and information, such as product manuals, frequently asked questions, videos, software updates, and customer support.
• On fin-keel vessels , the transducer should be mounted
À
more than 25 cm (10 in) and less than 75 cm (30 in) in front of the keel and less than 10 cm (4 in) to the side of the centerline.
• On full-keel vessels , the transducer should be mounted at
Á
a slight angle that aims at the bow, not parallel to the centerline.
• On power boats and hulls with chines , the transducer
Â
should not be mounted near the edge of sharp hull chines.
•On single-drive boats, the transducer must not be mounted in the path of the propeller.
•On twin-drive boats, the transducer should be mounted between the drives, if possible.
•The transducer should be mounted parallel to the bow-stern axis of your vessel.
•The transducer should be mounted in a location that allows accessibility to the transducer from the inside of the vessel.
•The transducer should not be mounted behind strakes, struts, fittings, water intake or discharge ports, or anything that creates air bubbles or causes the water to become turbulent.
•The transducer should not be mounted in a location where it might be jarred when launching, hauling, or storing.
•The transducer can cause cavitation that can degrade the performance of the boat and damage the propeller.
•The transducer must be in clean (non-turbulent) water for optimal performance.
•If you have a question about the location of the thru-hull transducer, contact your vessel builder or other owners of similar vessels for advice.
Tools Needed
•Drill
•43 mm (1 11/16 in.) hole saw
•52 to 55 mm (2 1/16 to 2 3/16 in.) hole saw (cored-fiberglass hull installations)
•Marine sealant
•Silicone grease
•Cable cutter
•Metal file (metal-hull installations)
•Fiberglass cloth and resin (option for sealing a coredfiberglass hull)
•43 mm (1 11/16 in.) cylinder, wax, tape, and casting epoxy (option for sealing a cored-fiberglass hull)
Installing the Thru-Hull Transducer
If you are installing the transducer in a cored-fiberglass hull, you must first prepare the hull (Preparing a Cored-Fiberglass Hull, page 2).
April 2017 190-02112-02_0C
1Use a 43 mm (1 11/16 in.) hole saw to cut through the hull at the mounting location.
2 Insert the thru-hull fitting in the hull.
3Apply marine sealant to the outer flange of the thru-hull fitting and tighten the nut by hand.
4 Slide both rubber O-rings onto the plug.
5 Apply silicone grease to the outside of the plug.
6Using a slow, twisting motion, insert the plug into the thru-hull fitting.
7 Verify that the plug is properly seated into the fitting.
8Mount the fitting with the pin at a 90 degree angle to the centerline of the boat.
9After the marine sealant applied in step 3 has cured, remove the nut and apply sealant on the fitting inside the hull.
10Replace the nut and tighten it by hand.
11After installation of the fitting, replace the plug with the actual transducer.
NOTE: It is recommended that you keep the plug for use while cleaning or servicing your transducer.
12Install the wire locking device onto the transducer.
Preparing a Cored-Fiberglass Hull
NOTICE
If the core of a cored-fiberglass hull is not sealed properly, water may seep into the core and severely damage the boat.
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Fiberglass or casting epoxy (not included) |
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Cylinder spacer (not included) |
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Inner fiberglass skin |
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Core |
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Outer fiberglass skin |
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1 Drill the hole through the hull.
2Seal the core inside the hull using either fiberglass (Sealing the Hull with Fiberglass, page 2) or casting epoxy (Sealing the Core with Casting Epoxy, page 2).
Drilling a Hole in a Cored-Fiberglass Hull
1From inside the boat, drill a 3 mm (1/8 in.) pilot hole completely through the hull.
2Examine the pilot hole on the outside of the boat, and select an option:
•If the pilot hole is not in the correct location, seal the hole with epoxy and repeat step 1.
•If the pilot hole is in the correct location, use a 43 mm (1
11/16 in.) hole saw to cut a hole from the outside of the boat through the outer fiberglass skin only. Do not cut completely through the hull.
3On the inside of the boat, at the pilot hole location, use a hole saw to cut a hole 9 to 12 mm (3/8 to 1/2 in.) larger than the hole you cut in the outside of the boat in step 2.
Cut through the inner fiberglass skin and most of the core, without cutting the outer skin.
NOTE: When cutting the inner fiberglass skin and core, be careful to not cut the outer fiberglass skin, or you will not be able to correctly seal the hull.
4 Remove the inner fiberglass skin and core you cut in step 3.
You should be able to see the inside of the outer fiberglass skin.
5Sand the inside of the hole and the areas immediately around both the inside and outside fiberglass skin.
6Clean the area using a mild detergent or weak solvent, such as isopropyl alcohol, to remove any dust and dirt.
Sealing the Hull with Fiberglass
1From inside the boat, coat a layer of fiberglass cloth with fiberglass resin and place it inside the hole to seal the core.
2Add layers of fiberglass cloth and resin until the hole is the correct diameter of 43 mm (1 11/ 16 in.).
3After the fiberglass has hardened, sand and clean inside and around the hole.
The cored-fiberglass hull is now prepared, and you can complete the transducer installation.
Sealing the Core with Casting Epoxy
To properly seal the core with casting epoxy, you must create a cylinder with a diameter of 43 mm (1 11/ 16 in.) to act as a spacer as the epoxy sets.
1 Coat a 43 mm (1 11/ 16 in.) cylinder with wax.
2Insert the cylinder in the hole through the outer skin and tape it in place on the outside of the boat.
3Fill the space between the cylinder the core with casting epoxy.
4After the epoxy has hardened, remove the cylinder, and sand and clean inside and around the hole.
The cored-fiberglass hull is now prepared, and you can complete the transducer installation.
NMEA 2000® Connection
The GDT 43 transducer connects to the NMEA 2000 network through the NMEA 2000 adapter.
gWind™ Wireless 2 transducer
À
GNX™ Wind instrument
Á
NMEA 2000 adapter
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2
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