Humminbird 987C SI COMBO User Manual
18
GPS RECEIVER INSTALLATION
(987c SI Combo models only)
NOTE: You will only need to perform this procedure if you have a GPS Receiver.
To optimize performance of the GPS receiver, mount it in an area that has full exposure
to the sky. The effective area of reception is 10° above the horizon. Different
circumstances determine the mounting method appropriate for your GPS receiver.
to the sky. The effective area of reception is 10° above the horizon. Different
circumstances determine the mounting method appropriate for your GPS receiver.
If you have… Then use:
STEM MOUNTING WITH AN EXISTING 1" - 14 THREAD STEM
Follow these steps to stem mount the GPS receiver:
NOTE: If you have an existing stem for mounting the GPS receiver, proceed directly to step 2
of the following procedure.
of the following procedure.
1. Determine the best location to mount your GPS receiver. Preplan and test the
cable routing to your control head before any drilling or cutting of your boat
surfaces. If you have purchased hardware to stem mount your GPS receiver,
follow the instructions included with that hardware to mount the stem
(antenna pole).
surfaces. If you have purchased hardware to stem mount your GPS receiver,
follow the instructions included with that hardware to mount the stem
(antenna pole).
NOTE: AS-EC10 10' extension cables are available from Humminbird® if your planned routing
exceeds 20', (6 m). Maximum cable length, including extensions, should not exceed 50' (15 m).
exceeds 20', (6 m). Maximum cable length, including extensions, should not exceed 50' (15 m).
NOTE: Remember to caulk or seal screw holes and drilled holes as needed to protect your
boat from water damage.
boat from water damage.
2. Screw on the receiver base to the stem first,
making sure that the stem pipe does not
protrude from the receiver base. This adds
protection to the cable when pulling it through
the pipe stem. In addition to this, de-burr the
pipe edges to reduce cable abrasion.
making sure that the stem pipe does not
protrude from the receiver base. This adds
protection to the cable when pulling it through
the pipe stem. In addition to this, de-burr the
pipe edges to reduce cable abrasion.
3. Use electrical tape to secure the NMEA pigtail
to the cable as shown.
to the cable as shown.
NOTE: Leave the NMEA pigtail secured to the cable
unless needed. This will make removing the receiver
easier.
unless needed. This will make removing the receiver
easier.
4. Route the GPS receiver cable through the stem and continue with the planned
route you chose in step 1.
5. Attach the GPS receiver to its base using the included #6 - 7/8" (22 mm) screws.
NMEA Pigtail Taped
1
NMEA Pigtail Cable Out
2
Mounting Screws
3
Cable Route
4
1
2
3
4
Receiver
1
Receiver Base
2
Stem Pipe
3
1
2
3
An existing antenna stem with
standard 1" – 14 thread
standard 1" – 14 thread
Access for cable routing under
the mounting location
the mounting location
No access under the mounting
location
location
Stem Mount with Existing 1” - 14 Thread Stem
Access Under Mounting Location
No Access Under Mounting Location