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GPS Receiver Installation
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.
If you have… Then use:
An antenna stem with standard 1” – 14 thread Stem Mount with 1" - 14 Thread
Access under mounting location Access Under Mounting Location
No access under mounting location No Access Under Mounting Location
Stem Mount with 1” - 14 Thread
Follow these steps to stem mount the GPS receiver:
1. If you have a pre-existing stem mount, skip to step 2. If you
need to mount the antenna pole (stem), determine the best
location, preplan and test the cable routing to your Fishfinder
unit before any drilling or cutting of your boat surfaces, then
route the 20’ (6 m) cable to the desired mounting location.
Mark the location and drill a 3/4” (19 mm) hole for the cable
and cable connector. If you have purchased hardware to stem
mount your GPS receiver, follow the instructions included with
that hardware to attach the stem to the boat.
NOTE: 10’ extension cables may be purchased from Humminbird® if
your planned cable route exceeds 20’ (6 m). Maximum cable length,
including extension cables, should not exceed 50’ (16 m). Visit our
website at www.humminbird.com, or call our Customer Resource
Center at 1-800-633-1468 to purchase extension cables.
2. Screw on the receiver base to the stem first, making sure
that the stem pipe does not protude from the receiver base.
This adds protection to the cable when pulling it through
the pipe stem. In addition to this, deburr the pipe edges to
reduce cable abrasion.
3. Use electrical tape to secure the NMEA pigtail to the cable as
shown in the illustration.
4
Stem Mount, Attaching
Receiver Base to Stem
Receiver
Base
Receiver Head
Antenna
Stem
NMEA
Pigtail
Taped
NMEA
Pigtail
Cable Out
NMEA Pigtail
Taped to Cable