Eagle Electronics SeaCharter 502cDF - Manual (Page 37)

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Sonar unit with external temp sensor, external speed sensor or combo
speed/temp sensor. The primary temperature sensor is built
into the transducer.
Optional Speed Sensor Installation
All the units in this series can display speed and distance traveled, but
only the SeaCharter 502cDF iGPS comes packed with a speed sensor. If
you wish to purchase an optional additional sensor for your unit, refer
to the accessory ordering information inside the back cover of this
manual. The following instructions describe how to install the speed
sensor.
Recommended tools for this job include: drill, 5/8" drill bit, 1/8" drill bit for
pilot holes, screwdriver. Required supplies for this job include: four #8
stainless steel wood screws (3/4" long), high quality, marine grade above-
or below-waterline sealant.
First find a location on the boat's transom where the water flow is smooth-
est. Don't mount the sensor behind strakes or ribs. These will disturb the
water flow to the speed sensor. Make sure the sensor will remain in the
water when the boat is on plane.
Speed or combo
speed/temp sensor
Sonar unit rear view
Temp
sensor
Temp sensor built
into transducer
Power/transducer
cable 3-amp fuse
Power/transducer socket
Accessory
socket