SI units about nmea0183-signalk

[philgutowski]

@tkurki mind giving a bit more detail about what needs to be changed?

[tkurki]

Sure. We recently made the move to use SI units in Signal K. In practice this means that some of the quantities need to be changed so that they are using the correct units.

A practical example is that angles and directions are currently in degrees in signalk-parser-nmea0183. They need to be converted to radians.

All in all the parser's conversions from nmea0183 need to be checked so that they are in correct units.

See https://github.com/SignalK/specification/blob/master/keyswithmetadata.json

[tkurki]

Ping @fabdrol

[philgutowski]

Here's a start... #39

[tkurki]

Closed by #41