Include failed gga string in checksum exception
Merge branch 'add-emulator'

It's probably safe to merge this in, it's not going to be used by anything while it's broken
Merge branch 'add-emulator'

Merge in the fixes made on the pi
Changed arduino limits and added microsecond covnert to the python emulator
Added converts from degrees to microseconds and added convert between simulator sail angles and boat sail angles