Humminbird 998c SI - Manual (Page 45)

35 GPS- Stem Mount
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.
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).
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' (16 m).
NOTE: Remember to caulk or seal screw holes and drilled holes as needed to
protect your 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.
3. Use electrical tape to secure the NMEA pigtail to the cable as
shown.
NOTE: Leave the NMEA pigtail secured to the cable 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"
screws.
NMEA Pigtail Taped 1
NMEA Pigtail Cable Out 2
Mounting Screws 3
Cable Route 4
1
2
4
3
Receiver 1
Receiver Base 2
Stem Pipe 3
1
2
3