GPSMAP® 74xx/76xx
Series
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.
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. In addition, connecting the power cable without the appropriate fuse in place voids the product warranty.
CAUTION
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 obtain the best performance and to avoid damage to your boat, install the 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.
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.

Software Update
You may need to update the chart plotter software after installation. For the instructions on how to update the software, see the owner’s manual at garmin.com/manuals/GPSMAP7400 -7600.
Tools Needed

• Drill and drill bits
  ◦ Bail mount: drill bits appropriate for the surface and hardware
  ◦ Flush-mount: 13 mm (/16 in.), and 3.5 mm (1 /2 in.) drill bit, 7.2 mm (51/8 in.) drill bit.

• 2 Phillips screwdriver

• Jigsaw or rotary tool

• File and sandpaper

• Marine sealant (recommended)

Mounting Considerations

NOTICE
This device should be mounted in a location that is not exposed to extreme temperatures or conditions. The temperature range for this device is listed in the product specifications. Extended exposure to temperatures exceeding the specified temperature range, in storage or operating conditions, may cause device failure. Extreme-temperature-induced damage and related consequences are not covered by the warranty.
When selecting a mounting location, you should observe these considerations.

• The location should provide optimal viewing as you operate your boat.
• The location should allow for easy access to all device interfaces, such as the keypad, touchscreen, and card reader, if applicable.
• The location must be strong enough to support the weight of the device and protect it from excessive vibration or shock.
• To avoid interference with a magnetic compass, the device should not be installed closer to a compass than the compass-safe distance value listed in the product specifications.
• The location must allow room for the routing and connection of all cables.
• The location must not be a flat, horizontal surface. The location should be at a vertical angle.
  The location and viewing angle should be tested before you install the device. High viewing angles from above and below the display may result in a poor image.

Bail Mounting the Device
NOTICE
If you are mounting the bracket on fiberglass with screws, it is recommended to use a countersink bit to drill a clearance counterbore through only the top gel-coat layer. This will help to avoid cracking in the gel-coat layer when the screws are tightened.
The bail-mounting hardware (screws and washers, or nuts, washers, and bolts) is not included. The bail mount bracket is included in some models. Before you can bail mount the device, you must purchase a bail mount bracket, if necessary. You must also purchase mounting hardware that fits the holes in the bail mount bracket and securely attaches it to your specific mounting surface. The size of the pilot holes required depends on the mounting hardware you purchase.

1. Using the bail mount bracket as a template, mark the location of the four pilot holes.
   

2. Using a drill bit appropriate for your mounting hardware, drill the pilot holes.

3. Secure the bail mount bracket to the surface using your mounting hardware.

4. Install the bail mount knobs on the sides of the device.

5. Place the device in the bail mount bracket, and tighten the bail amount knobs.

Flush Mounting the Device

NOTICE
Be careful when cutting the hole to flush mount the device. There is only a small amount of clearance between the case and the mounting holes, and cutting the hole too large could compromise the stability of the device after it is mounted. The included template and hardware can be used to flush mount the device in your dashboard.

1. Trim the template and make sure it fits in the location where you want to mount the device.

2. Secure the template to the selected location.

3. Using a 13 mm (½ in.) drill bit, drill one or more of the holes inside the corners of the solid line on the template to prepare the mounting surface for cutting.

4. Using a jigsaw or a rotary tool, cut the mounting surface along the inside line on the template.

5. Place the device in the cutout to test the fit.

6. If necessary, use a file and sandpaper to refine the size of the cutout.

7. After the device fits correctly in the cutout, ensure the mounting holes on the device line up with the larger 7.2 mm(5/16 in.) holes on the template.

8. If the mounting holes on the device do not line up, mark the new hole locations.

9. Using a 7.2 mm (5/16 in.) drill bit, drill the larger holes.

10. Starting in one corner of the template, place a nut plate over the larger hole drilled in step 9.
    The smaller 3.5 mm (1/8 in.) hole on the nut plate should line up with the smaller hole on the template.

11. If the smaller 3.5 mm (1/8 in.) hole on the nut plate does not line up with the smaller hole on the template, mark the newshole location.

12. Repeat steps 10 and 11 to verify the placement of the remaining nut plates and holes on the template.

13. Using a 3.5 mm (1/8 in.) drill bit, drill the smaller holes.

14. Remove the template from the mounting surface.

15. Starting in one corner of the mounting location, place a nut plate on the back of the mounting surface, lining up the large and small holes.
    The raised portion of the nut plate should fit into the larger whole.
    

16. Secure the nut plate to the mounting surface by fastening an included M3 screw through the smaller 3.5 mm (1/8 in.)hole.

17. Repeat steps 15–16 to secure the remaining nut plates to the mounting surface.

18. Install the rubber gasket on the back of the device.
    The pieces of the rubber gasket have adhesive on the back.
    Make sure you remove the protective liner before installing them on the device.

19. If you will not have access to the back of the device after you mount it, connect all necessary cables to the device before placing it into the putout.
    NOTE: To prevent corrosion of the metal contacts, cover unused connectors with the attached weather caps.

20. Apply marine sealant between the mounting surface and the device to properly seal and prevent leakage behind the dashboard.

21. If you will have access to the back of the device, apply marine sealant around the cutout.

22. Place the device into the cutout.

23. Secure the device to the mounting surface using the included M4 screws.

24. Wipe away all excess marine sealant.

25. Install the decorative bezel by snapping it in place around the edges of the device.

Cable and Connection Considerations

• The cables may have been packaged without the locking rings installed. If so, you should route the cables before you install the locking rings.
• After connecting a locking ring to a cable, make sure the ring is securely connected and the O-ring is in place so the connection remains secure.

Power/NMEA® 0183 Cable

• The wiring harness connects the device to power, NMEA 0183 devices, and a lamp or a horn for visible or audible alerts.
• If it is necessary to extend the NMEA 0183 or alarm wires, you must use 22 AWG (.33 mm²) wires.

Connecting the Wiring Harness to Power
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. In addition, connecting the power cable without the appropriate fuse in place voids the product warranty.

1. Route the wiring harness to the power source and to the device.
2. Connect the red wire to the positive (+) battery terminal, and connect the black wire to the negative (-) battery terminal.
3. If necessary, install the locking ring and O-ring on the end of the wiring harness.
4. Insert the cable into the POWER connector on the back of the device, pushing firmly.
5. Turn the locking ring clockwise to attach the cable to the device.

Additional Grounding Consideration
This consideration is applicable only to devices that have a grounding screw. Not all models have a grounding screw. This device should not need additional chassis grounding in most installation situations. If you experience interference, the grounding screw on the housing can be used to connect the device to the water ground of the boat to help avoid the interference.

Garmin Marine Network Considerations
NOTICE
A Garmin Marine Network PoE Isolation Coupler (010-10580-10) must be used when connecting any third-party device, such as a FLIR ® camera, to a Garmin Marine Network. Connecting a Power over Ethernet (PoE) device directly to a Garmin Marine Network Chartplotter damages the Garmin Chartplotter and may damage the PoE device. Connecting any third-party device directly to a Garmin Marine Network Chartplotter will cause abnormal behavior on the Garmin devices, including the devices not properly turning off or the software, becoming inoperable.
This device can connect to additional Garmin Marine Network devices to share data such as radar, sonar, and detailed mapping. When connecting Garmin Marine Network devices to this device, observe these considerations.

• All devices connected to the Garmin Marine Network must be connected to the same ground. If multiple power sources are used for Garmin Marine Network devices, you must tie all ground connections from all power supplies together using a low resistance connection or tie them to a common ground bus bar, if available.

• A Garmin Marine Network cable must be used for all Garmin Marine Network connections.
  ◦ Third-party CAT5 cable and RJ45 connectors must not be used for Garmin Marine Network connections.
  ◦ Additional Garmin Marine Network cables and connectors are available from your Garmin dealer.

• The NETWORK ports on the device each act as a network switch. Any compatible device can be connected to any NETWORK port to share data with all devices on the boat connected by a Garmin Marine Network cable.

NMEA 2000® Considerations

NOTICE
If you are connecting this device to an existing NMEA 2000 network, the NMEA 2000 network should already be connected to power. Do not connect the NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be connected to an NMEA 2000 network.
If you are connecting this device to an existing NMEA 2000 network or engine network by another manufacturer, you should install an NMEA 2000 Power Isolator (010-11580-00) between the existing network and the Garmin devices.
If you are installing an NMEA 2000 power cable, you must
connect it to the boat ignition switch or through another in-line switch. NMEA 2000 devices will drain your battery if the NMEA 2000 power cable is connected to the battery directly.
This device can connect to an NMEA 2000 network on your boat to share data from NMEA 2000 compatible devices such as a GPS antenna or a VHF radio. The included NMEA 2000 cables and connectors allow you to connect the device to your existing NMEA 2000 network. If you do not have an existing NMEA 2000 network you can create a basic one using cables from Garmin.
If you are unfamiliar with NMEA 2000, you should read the “NMEA 2000 Network Fundamentals” chapter of the Technical Reference for NMEA 2000 Products. You can find this document using the “Manuals” link on the product page for your device at www.garmin.com.
The port labeled NMEA 2000 is used to connect the device to a standard NMEA 2000 network.

NMEA 0183 Connection Considerations

• See the installation instructions for the NMEA 0183 device to identify the transmit (Tx) A (+) and B (-) wires and receive (Rx) A (+) and B (-) wires.

• Each internal Rx and Tx port has 2 wires, labeled A (+) and B (-) according to the NMEA 0183 convention. The corresponding A (+) and B (-) wires of each internal port should be connected to the A (+) and B (-) wires of the NMEA 0183 device. See the table and wiring diagrams when connecting the data cable to NMEA 0183 devices.

• You must use 28 AWG, shielded, twisted-pair wiring for extended runs of wire. Solder all connections and seal them with heat-shrink tubing.

• See (Specifications, page 5) for a list of the approved NMEA 0183 sentences that are output by and input to your device.

• The internal NMEA 0183 ports and communication protocols are configured on the connected Garmin device. See the NMEA 0183 section of the Chartplotter owner’s manual for more information.

• The ground wires on the NMEA 0183 data cable and your NMEA 0183 device must both be connected to the ground.

• When connecting NMEA 0183 devices with two transmitting and two receiving wires, it is not necessary for the NMEA 0183 devices to connect to a common ground.

• When connecting an NMEA 0183 device with only one transmitting (Tx) wire or with only one receiving (Rx) wire, the NMEA 0183 devices must be connected to a common ground.

• For two-way communication with an NMEA 0183 device, the internal ports on the NMEA 0183 data cable are not linked.
  For example, if the input of the NMEA 0183 device is connected to the internal output port 1 on the data cable, you can connect the output port of your NMEA 0183 device to any of the internal input ports (port 1, port 2, port 3, or port 4) on the wiring harness.

• There are four internal NMEA 0183 input ports (Rx ports), and two internal NMEA 0183 output (Tx ports) on the included NMEA 0183 data cable. You can connect one NMEA 0183 device per internal Rx port to input data to your Garmin device, and you can connect up to three NMEA 0183 devices in parallel to each internal Tx port to receive data output by your Garmin device.
  NMEA 0183 Connection Diagram
  

Device Wire Function**
---|---|---|---
1| Power| Red| Power
2| Ground| Black| Data ground
3| | | Ground
4| Tx (Out)| Blue| RYJA (In 4.)
5| Rx (In)| Brown| Tx/A (Out 4.)

Lamp and Horn Connections
The device can be used with a lamp, a horn, or both, to sound or flash an alert when the chart plotter displays a message. This is optional, and the alarm wire is not necessary for the device to function normally. When connecting the device to a lamp or horn, observe these considerations.

• The alarm circuit switches to a low-voltage state when the alarm sounds.
• The maximum current is 100 mA, and a relay is needed to limit the current from the Chartplotter to 100 mA.
• To manually toggle visual and audible alerts, you can install single-pole, single-throw switches.

Video-Input and Output Considerations
This device allows video input from composite video sources and video output to a monitor, depending on the model. When connecting video input and output sources, observe these considerations.

• The Chartplotter may have one composite-video input port labeled CVBS IN or two composite-video input ports labeled VIDEO 1 and VIDEO 2.
  ◦ The composite-video ports use BNC connectors. You can use a BNC to RCA adapter to connect a composite-video source with RCA connectors to these ports.
  ◦ The video from sources connected to these ports is available only for display on the device or on an additional monitor connected to the device. Composite video is not shared across the Garmin Marine Network or NMEA 2000 network.

• The Chartplotter may have one DVI-D video output port. You can connect a DVI-D or DVI-I cable to the port to view a mirror image of the screen on a computer monitor or HD TV.
  ◦ If your device includes a DVI cable connector, a rubber gasket is included. This gasket must be installed between the DVI port and cable connector to avoid damage to the connector.
  ◦ If needed, you can use a DVI-D to HDMI® adapter to connect to an HD TV or other HDMI compatible display
  ◦ Although it is recommended to use DVI cables sold by Garmin, high-quality third-party DVI cables may be used. You should test the DVI cable by connecting the devices before routing the cable.

J1939 Engine Network Connection Considerations

NOTICE
You must use a Garmin GPSMAP J1939 accessory cable when connecting the Chartplotter to the J1939 engine network to prevent corrosion due to moisture. Using a different cable void your warranty.
If you have an existing engine network on your boat, it should already be connected to power. Do not add any additional power supply.
This Chartplotter can connect to an engine network on your boat to read data from compatible devices such as certain engines. The engine network follows a standard and uses proprietary messages.
You should connect only one Chartplotter to one engine network. Connecting more than one chart plotter to one engine network may result in unexpected behavior.
The port labeled J1939 is used to connect the device to the existing engine network. You must route the cable within 6 m (20 ft.) of the engine network backbone.
The Garmin GPSMAP J1939 accessory cable requires connection to a power source and proper termination. For more information on connecting to your engine network, see the manufacturer’s engine documentation.

Specifications

All Models

7×07 Models

7×08 Models

7×10 Models

¹The 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.

7×12 Models

7×16 Models

NMEA 2000 PGN Information
Transmit and Receive

Transmit

Receive

NMEA 0183 Information
Transmit

Receive

You can purchase complete information about National Marine Electronics Association (NMEA) format and sentences from www.nmea.org.
J1939 PGN Information
The Chartplotter can receive J1939 PGN sentences. The Chartplotter cannot transmit over the J1939 network.

© 2016 Garmin Ltd. or its subsidiaries
Garmin®, the Garmin logo, and GPSMAP® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. 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. HDMI® is a registered trademark of HDMI Licensing, LLC.
© 2016 Garmin Ltd. or its subsidiaries
support.garmin.com

References

• Garmin Customer Support
• Garmin International | Home
• GPSMAP® 7412 | Garmin Support Close Close IE Banner
• Water Rating Definitions | Garmin

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