A128 lake water temp

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Steve,

I was faced with the same issue onboard my own boat as I also had an in-hull fishfinder transducer and a CPT-200. Temperature data may be added to the system via any of the following methods:
- interface an i40 Bidata with a transom mounted or thru-hull instrument speed/temp transducer to the system
- interface an i50 Tridata with a transom mounted or thru-hull instrument speed/temp transducer to the system ... the i50 TriData will repeat depth from a128 MFD
- interface an i70S MFID and iTC-5 with a transom mounted or thru-hull instrument speed/temp transducer to the system ... the option used onboard my own boat
- interface a third party NMEA 2000 transom mounted or thru-hull instrument speed/temp transducer to the system ... no calibration of temperature or speed through water is supported via this option.