generate NMEA 0183 sentences with private unit

[CVL]

You can do that by creating an expression in the create nmea sentence window, then "-" and 273.1 with " *. *" for 1 decimal place. I use this for a ds18 on the engine then have the mtw sentence showing in a dashboard on Opencpn so eng temp shows on the chart plotter.

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Thanks a lot, that was exactly what I was looking for. I have pretty much the same setup as yours, and would like to keep an eye on engine temperature when I am in the cockpit.

fair winds