Garmin GPSMAP 8700 User manual
GPSMAP®8700
INSTALLATION INSTRUCTIONS
Important Safety Information
WARNING
Failure to follow these warnings, cautions, and notices could result in personal injury, damage to the vessel or
device, or poor product performance.
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
To avoid possible personal injury, always wear safety goggles, ear protection, and a dust mask when drilling,
cutting, or sanding.
To avoid possible personal injury or damage to the device and vessel, disconnect the vessel's power supply
before beginning to install the device.
To avoid possible personal injury or damage to the device or vessel, before applying power to the device, make
sure that it has been properly grounded, following the instructions in the guide.
To avoid possible personal injury or damage to this device and vessel, only install this device when the vessel is
on land, or when properly secured and docked in calm water conditions.
NOTICE
For the best possible performance, the device must be installed according to these instructions.
When drilling or cutting, always check what is on the opposite side of the surface to avoid damaging the vessel.
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 chartplotter software after installation. For the instructions on how to update the
software, see the owner's manual at garmin.com/manuals/GPSMAP8700.
GUID-0E7D71DD-265C-4A81-9C9D-474AAB4BB516 v3April 2022
Connector View
POWER Power cable connection
NETWORK Garmin Marine Network
HDMI IN HDMI® in
HDMI OUT HDMI out to connect the chartplotter to a monitor. Required for device functionality.
CVBS IN Composite video in
Status LED
Power ground
Power button
NMEA 0183 NMEA® 0183 and audio out
USB HOST Micro-USB output for connecting a touchscreen monitor
USB OTG Micro-USB input from compatible Garmin card reader1, computer, or other supported USB
accessory
NMEA 2000 NMEA 2000® network
J1939 J1939 network
Tools Needed
• Drill
• Drill bits appropriate for the surface and hardware (3.2 mm (1/8 in.) drill bit for included screws)
• Phillips screwdriver
• Pencil
1 Only compatible Garmin card readers recommended. Third-party card readers are not guaranteed to be fully compatible.
2
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 (Specifications, page 18). 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.
• You must mount the device in a location where it will not be submerged.
• You must mount the device in a location with adequate ventilation where it will not be exposed to extreme
temperatures.
• You must mount the device at least 2.54 cm (1 in.) from cables and other potential sources of interference.
• You must mount the device in a location that allows room for the routing and connection of all cables.
Mounting the GPSMAP 8700 Black Box Device
NOTICE
If you are mounting the device in fiberglass, when drilling the pilot holes, 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.
NOTE: Screws are included with the device, but they may not be suitable for the mounting surface.
Before you mount the device, you must select a mounting location, and determine what screws and other
mounting hardware are needed for the surface.
1Place the black box device in the mounting location, and mark the location of the pilot holes.
2Drill a pilot hole for one corner of the device.
3Loosely fasten the device to the mounting surface with one corner, and examine the other three pilot-hole
marks.
4Mark new pilot-hole locations if necessary, and remove the device from the mounting surface.
5Drill the remaining pilot holes.
6Secure the device to the mounting location.
Connection Considerations
When connecting this device to power and to other Garmin devices, you should observe these considerations.
• The power and ground connections to the battery must be checked to make sure they are secured and
cannot become loose.
• The cables may be packaged without the locking rings installed. The cables should be routed before the
locking rings are installed.
• After installing a locking ring on a cable, you should make sure the ring is securely connected and the o-ring
is in place so the power or data connection remains secure.
3
Connecting 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.
You should connect the red wire to the power source through the ignition or another manual switch to turn the
device on and off.
1Route the power cable between the power source and the device.
2Connect the red power wire to the ignition or another manual switch, and connect the switch to the positive
(+) battery terminal if necessary.
3Connect the black wire to the negative (-) battery terminal or to ground.
4Connect the power cable to the device, and turn the locking ring clockwise to tighten it.
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.
Splice
• Up to 4.6 m (15 ft.): 10 AWG (5.26 mm2) extension wire
• Up to 7 m (23 ft.): 8 AWG (8.36 mm2) extension wire
• Up to 11 m (36 ft.): 6 AWG (13.29 mm2) extension wire
Fuse (10 A, 42 V fast-acting)
20.3 cm (8 in.)
Battery
20.3 cm (8 in.)
11 m (36 ft.) maximum extension
4
Power Considerations
While you can turn the device on and off using the power key, the device will likely not be easily accessible to do
so. You should consider connecting a switch or one of the following to turn the GPSMAP 8700 device on and
off:
• A GRID™ device
NOTE: A GRID 20 device will not turn the GPSMAP 8700 device on or off. Using the power key on the GRID 20
device will place the GPSMAP 8700 device into sleep mode.
• Another Garmin chartplotter
• A GMM™ monitor
When power is applied to the GPSMAP 8700 device, the device will turn on. You cannot disable the auto power
on feature.
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.
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 5).
• Stations are created and modified using the device software. See the owner's manual provided with the
device for more information.
5
GMM Monitor Connection Considerations
You can use a GMM monitor to view and control the GPSMAP 8700. When connecting a GMM monitor to the
GPSMAP 8700 device, you must observe these considerations.
• The touchscreen functionality of the GMM monitor can be used to control one GPSMAP 8700 device.
• Although it is recommended to use Garmin DVI-D cables, high-quality third-party DVI-D cables may be used.
Before you route a DVI-D cable, you should connect all devices to it for testing.
• You must use an HDMI to DVI-D cable or adapter.
• You must connect the GMM monitor to the same power source as the GPSMAP 8700 device. If this is not
possible, you must connect the devices to the same ground.
• You must connect the GMM monitor to a NETWORK port on the GPSMAP 8700 device or to the same Garmin
Marine Network as the GPSMAP 8700 device.
• The touch data is sent over the Garmin Marine Network.
Devices
Item Device
GPSMAP chartplotter
GMM touchscreen monitor
Connections
From To Cable
Chartplotter's HDMI OUT port GMM monitor's MAIN DVI VIDEO IN port
DVI-D cable with an HDMI
adapter
GMM monitor's GARMIN
PROCESSOR BOX port
Chartplotter's NETWORK port or the
Garmin Marine Network
Garmin Marine Network
Cable
6
NMEA 2000 Considerations
NOTICE
If you are connecting to an existing NMEA 2000 network, identify the NMEA 2000 power cable. Only one NMEA
2000 power cable is required for the NMEA 2000 network to operate properly.
A NMEA 2000 Power Isolator (010-11580-00) should be used in installations where the existing NMEA 2000
network manufacturer is unknown.
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.
This device is not powered through the NMEA 2000 network. You must connect the device to a power source
(Connecting to Power, page 4).
If you are unfamiliar with NMEA 2000, you should read the Technical Reference for NMEA 2000 Products at
garmin.com/manuals/nmea_2000.
The port labeled NMEA 2000 is used to connect the device to a standard NMEA 2000 network.
7
Item Description
NMEA 2000 compatible Garmin device
GPS antenna
Ignition or in-line switch
NMEA 2000 power cable
NMEA 2000 drop cable
12 Vdc power source
NMEA 2000 terminator or backbone cable
NMEA 2000 T-connector
NMEA 2000 terminator or backbone cable
8
NMEA 0183 Connection Considerations
• The chartplotter provides one Tx (transmit) port and one Rx (receive) port.
• Each 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.
• You can connect one NMEA 0183 device to the Rx port to input data to this chartplotter, and you can connect
up to three NMEA 0183 devices in parallel to the Tx port to receive data output by this chartplotter.
• See the NMEA 0183 device installation instructions to identify the transmit (Tx) and receive (Rx) wires.
• You must use 28 AWG, shielded, twisted-pair wiring for extended runs of wire. Solder all connections and seal
them with heat-shrink tubing.
• Do not connect the NMEA 0183 data wires from this device to power ground.
• The power cable from the chartplotter and the NMEA 0183 devices must be connected to a common power
ground.
• The internal NMEA 0183 ports and communication protocols are configured on the chartplotter. See the
NMEA 0183 section of the chartplotter owner's manual for more information.
• See the chartplotter owner's manual for a list of the approved NMEA 0183 sentences that the chartplotter
supports.
NMEA 0183 Device Connections
This diagram illustrates two-way connections for both sending and receiving data. You can also use this
diagram for one-way communication. To receive information from a NMEA 0183 device, refer to items , ,
, , and when connecting the Garmin device. To transmit information to a NMEA 0183 device, refer to
items , , , , and when connecting the Garmin device.
9
Item Description
Power source
Power cable
NMEA 0183 device
NMEA 0183 cable
Item Garmin Wire Function Garmin Wire Color NMEA 0183 Device Wire
Function
Power Red Power
Power ground Black Power ground
Data ground Black Data ground
Rx/A (In +) White/orange Tx/A (Out +)
Rx/B (In -) White Tx/B (Out -)
Tx/A (Out +) Gray Rx/A (In +)
Tx/B (Out -) Pink Rx/B (In -)
If the NMEA 0183 device has only one input (receive, Rx) wire (no A, B, +, or -), you must leave the pink wire
unconnected.
If the NMEA 0183 device has only one output (transmit, Tx) wire (no A, B, +, or -), you must connect the white/
orange wire to ground.
10
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