Garmin GPSMAP 8400 series Installation Instructions Manual Download Page 3

addition, connecting the power cable without the appropriate 

fuse in place voids the product warranty.

1

Route the power cable 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

Install the locking ring and o-ring on the end of the power 

cable.

4

Connect the power cable to the device by turning the locking 

ring clockwise.

Additional Grounding Consideration

This device should not need additional chassis grounding in 

most installation situations. If you experience interference, you 

can use the grounding screw on the housing to connect the 

device to the water ground of the boat to help avoid the 

interference.

Power Cable Extensions

If necessary, the power cable can be extended using the 

appropriate wire gauge for the length of the extension.

Item

Description

À

Fuse

Á

Battery

Â

6 ft. (1.8 m) no extension

Item Description

À

Splice

Á

• 10 AWG (5.26 mm²) extension wire, up to 15 ft. (4.6 m)
• 8 AWG (8.36 mm²) extension wire, up to 23 ft. (7 m)
• 6 AWG (13.29 mm²) extension wire, up to 36 ft. (11 m)

Â

Fuse

Ã

8 in. (20.3 cm)

Ä

Battery

Å

8 in. (20.3 cm)

Æ

36 ft. (11 m) maximum extension

Station Connection Considerations

This device can be set up in conjunction with other compatible 

Garmin devices to work together as a station. When planning 

stations on your boat, observe these considerations.

• Devices earlier than the GPSMAP 8000 series and GPSMAP 

8500 series cannot be used in a station.

• Although it is not necessary, it is recommended that you 

install all of the devices you plan to use in one station near 

each other.

• No special connections are necessary to create a station, as 

long as all of the devices are connected to the Garmin Marine 

Network (

Garmin Marine Network Considerations

page 3

).

• Stations are created and modified using the device software. 

See the owner's manual provided with the device for more 

information.

Garmin Marine Network Considerations

NOTICE

A Garmin Power over Ethernet (PoE) Isolation Coupler (P/N 

010-10580-10) must be used when connecting any third-party 

device, such as a FLIR

®

 camera, to a Garmin Marine Network. 

Connecting a 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.

• 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 have an existing NMEA 2000 network on your boat, it 

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 a 

NMEA 2000 network.
If you are installing a 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 a 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.

3

Summary of Contents for GPSMAP 8400 series

Page 1: ...h SD Card 4 Read and agree to the terms 5 Select Download 6 Select Run 7 Select the drive associated with the memory card and select Next Finish Updating the Device Software Before you can update the...

Page 2: ...d tap M4 holes for the included machine screws and skip to step 19 10If using the nut plates starting in one corner of the template place a nut plate over the larger hole drilled in step 9 The smaller...

Page 3: ...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 abn...

Page 4: ...0183 devices must be connected to a common ground For two way communication with a NMEA 0183 device the internal ports on the NMEA 0183 data cable are not linked For example if the input of the NMEA...

Page 5: ...Red Power Power ground Black Power ground Data ground Black Data ground RxB Orange white N A RxA White TxA NMEA 0183 Pinout Port Wire Function Wire Color Pin Number Input port 1 RX A White RX B Orange...

Page 6: ...nt on the duplicated screen The Garmin GPSMAP HDMI accessory cable is 4 5 m 15 ft long If you need a longer cable you should use an active HDMI cable only You need an HDMI coupler to connect the two H...

Page 7: ...pecification Measurement 8422 8622 Max power usage 49 W Typical current draw at 12 Vdc 3 9 A Typical current draw at 24 Vdc 1 8 A Max current draw 6 A Fuse 15 A Compass safe distance 86 36 cm 34 in 84...

Page 8: ...netic MWD Wind direction and speed MDA Meteorological composite MWV Wind speed and angle VDM AIS VHF data link message You can purchase complete information about National Marine Electronics Associati...

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