Humminbird 531478-2_B - Manual (Page 10)

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.
4
Stem Mount,
Attaching Receiver
Base to Stem
Receiver
Base
Receiver Head
Antenna
Stem