Yes, everything is fine. I slightly adjusted the coefficient to match the values. There is a possibility of calibration after firmware, it is possible without it.
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Is there a reason you wanted to make your own as opposed to buying a commercial off-the-shelf solution? I am looking for an affordable STW sensor that I can integrate into a custom-built GPS/radio system, but I haven’t determined if the commercially available ones can be programmed to work with other GPS/radio/custom software.
you can use it in a boat if your system is built on NMEA 0183. if the system is based on NMEA 2000, then the software needs to be modified.