As a user, I expect Pressure in NMEA sentence to be compatible with OpenCPN

[sarfata]

OpenCPN doc says:

Measured Value	Transducer Type	Measured Data	Unit of measure	Transducer Name
barometric	"P" pressure	0.8..1.1 or 800..1100	"B" bar	"Barometer"

We should be publishing in Bars, which should work but Ron had to make a change to get this to work:
https://github.com/sarfata/kbox-firmware/pull/61/files#diff-e1a852b1882fac49cb1e32e9192d85e1R57

[ronzeiller]

I think Ron is right.
In KBox the sensor gives Pascal and also Signal K is Pascal which is ok.
The NMEA0183 building gets Pascal too, but here it should be bar
So 1/100000 should be right

May be also a new define in SKUnits.h?
#define SKPascalToBar(x) x / 1000000