Filter and convert incomming NMEA messages

[olewsaa]

I tried the calibration, fist with some I2C values as I'm not onboard, but home.  I struggled to get it to filter the values. I had no problem of making a calibration curve. The path for the signalK stream was confusing, it's normally separated by ".", but the example used "/". I tried both "." and "/" in the SignalK paths. In neither cases did the values seen on the instrument panel change. I also looked for some altereded name in the list in instrument panel. I use environment.inside.humidity (which report 0-1, and not 0-100%), no new variable with .cal or something appended.  Something I overlooked ?