Topic: speed/temp sensor

[smoke20]

I have a 898c si combo do I need to add a speed /temp sensor   or is the gsp speed ok  do a lot of trolling  thanks

[RzorbackAngler]

The gps speed will work just fine and will be the most accurate.  Your transducer has a temp sensor and will give you the water temp.  You may have to replace one of your chart displays with the temp display.  I replaced the lat/long with temp.