Eagle Electronics SeaChamp 2000 - Manual (Page 35)

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Speed/Temperature Sensors
This unit can accept as many as two temperature sensors, which can be
used to monitor the temperature of surface water, a live well or some
other location. These units can also accept an optional speed sensor for
showing speed and distance traveled. However, you can only use one
accessory at a time. If you would like to use a speed sensor and a second
temperature sensor at the same time, you will need a combination device.
NOTE:
This unit is packed with a transducer containing a built-in temp sensor.
The SeaChamp package also includes a speed sensor. If you have a
FishStrike 2000c and want a speed sensor or additional temp sensor,
see the Accessory Ordering Information in the back of this manual.
If a second temp sensor is used, it must be the model TS-2U. This
model has a fixed electronic "address" which designates it as the second
of two temp sensors. Dual temperatures are only displayed on the Full
Chart page. The Large Digital page will only display the primary
temperature sensor. See the following wiring diagram for temperature
and speed sensor combinations.