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NOTE: It may not always be possible to get symmetrical fish arches and high speed depth
readings at the same time. Due to the wide variety of boat hulls, however, it is not always
possible to obtain high speed depth readings.
NOTE: It is often necessary to make several incremental transducer adjustments before
optimum high speed performance is achieved.
Once you have reached a consistently good sonar signal at the desired speeds, you are
ready to lock down the transducer settings.
5a. If you have a Single frequency transducer, mark the transducer bracket location
on the transom with a pencil, then pop up the bracket to reveal the mounting
screws. Find the third mounting hole in the vertical center of the bracket. Make
sure that the bracket location is the same and follow the drilling instructions for
your hull type. Fill the mounting hole with marine-grade silicone, then install
the third screw before snapping the transducer bracket closed.
Hand-tighten only!
5b. If you have a Dual frequency transducer, mark the transducer bracket location
on the transom with a pencil, then pop up the bracket to reveal the mounting
screws. Tighten the stainless steel mounting bracket screws to secure in place.
Hand-tighten only!
GPS RECEIVER INSTALLATION
(937c DF Combo and 937c 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.
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.
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.
An existing antenna stem with
standard 1" – 14 thread stem
Access for cable routing under
the mounting location
No access under the mounting
location
Stem Mount with Existing 1” - 14 Thread Stem
Access Under Mounting Location
No Access Under Mounting Location
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