Hi Rick
There is only one transducer. for speed/temperature. From page 2 of the owner's manual (see link below)
"A single-frequency with built-in temperature
sensor is packed with the X-510c"
Hope this helps and happy boating!
-Steve
http://www.lowrance.com/Root/Lowrance-Documents/X515cDF_X510c_0151-451_120406.pdf
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