
The smaller
9
/
64
in. (3.5 mm) hole
Â
on the nut plate should
line up with the smaller hole on the template.
11
If the smaller
9
/
64
in. (3.5 mm) hole on the nut plate does not
line up with the smaller hole on the template, mark the new
location.
12
Repeat steps 10–11 for each of the nut plates along the
sides of the device as indicated on the template.
13
Using a
9
/
64
in. (3.5 mm) 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
Ã
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
hole.
16
Secure the nut plate to the mounting surface by fastening an
included M3 screw
Ä
through the smaller
9
/
64
in. (3.5 mm)
hole.
17
Repeat steps 15–16 for each of the nut plates along the
sides of the device.
18
Install the rubber gasket
Å
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 cutout.
NOTE: To prevent corrosion of the metal contacts, cover
unused connectors with the attached weather caps.
20
Place the device into the cutout.
21
Secure the device to the mounting surface using the included
M4 screws
Æ
.
22
Install the decorative bezel by snapping it in place around the
edges of the device.
Connection Considerations
NOTICE
A blue rubber seal is included for each DVI port on the device.
This seal must be installed between each DVI port and DVI-
cable connector to avoid damage to the connectors.
When connecting the GMM device to power and to a GPSMAP
®
8500 device, observe these considerations.
• Although it is recommended to use the Garmin provided DVI
cables, high-quality third-party DVI cables may be used.
Before a DVI cable is routed, it should be tested by
connecting the devices with it.
• The GMM device should be connected to the same power
source as a connected GPSMAP 8500 device. If this is not
possible, the devices must be connected to the same
ground.
• The power and ground connections to the battery must be
checked to make sure they are secured and will not become
loose.
• The touchscreen functionality of the GMM device can be
used to control one GPSMAP 8500 device.
• The GMM device used to control a GPSMAP 8500 device
must be connected to both the GARMIN PROCESSOR BOX
and MAIN DVI VIDEO IN ports on the GMM and the
GARMIN MONITOR and MAIN DVI-I VIDEO ports on the
GPSMAP 8500 using a Garmin Marine Network cable and a
DVI-D cable.
• For easier cable routing, the power and Garmin Marine
Network cables are 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.
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 will void 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 Considerations
This device should not need any additional chassis grounding in
most installation situations. If interference is experienced, 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.
Power Cable Extensions
If necessary, the power cable can be extended using the
appropriate wire gauge for the length of the extension.
2
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