Lowrance electronic LCX-17M - Manual (Page 38)

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Stern view showing good location for mounting sensor on transom.
Speed sensor mounting configuration:
side view (left) and rear view (right.)
If the base of the transom has a radius, fill the gap between the
transom and the sensor with the sealant. This will help ensure a
smooth water flow.
Route the sensor's cable through or over the transom to the sonar unit.
If you need to drill a hole in the transom to pass the connector through,
the required hole size is 7/8".
CAUTION:
If you drill a hole in the transom for the cable, make sure it is
located above the waterline. After installation, be sure to seal the
hole with the same marine grade above- or below-waterline
sealant used for the screws.
The sensor is now ready for use. Connect the sensor to the sonar socket
on the back of your unit and connect the transducer to the speed
sensor's socket. If you have any questions concerning the installation of
the sensor, please contact your local boat dealer.
GPS Antenna/Receiver Module
The LCX-17M packages include the LGC-2000 GPS module. This device
contains the unit's external antenna and receiver for GPS and WAAS
Good location
Transom
Bottom of hull
Bottom of hull