			#!/usr/bin/env python3

			import socket, math

			def NMEAaddChecksum(nmea) :
			checksum = 0

			for c in nmea[1:] :
			checksum = checksum ^ ord(c)
			nmea += '*' + format(checksum, '02X') + '\r' + '\n'
			return nmea

			def sendNMEA(s, nmea) :
			nmea = NMEAaddChecksum(nmea)
			print(nmea)
			#s.send(nmea)

			# sinus degrees
			def sind(deg) :
			return math.sin(math.radians(deg))

			# cosinus degrees
			def cosd(deg) :
			return math.cos(math.radians(deg))

			# Move a boat a the surface of the earth.
			# A move of 1 Nautical Mille in latitude is 1'
			# A move of 1 Nautical Mille in longitude is 1' * cos(lat)
			def moveBoat(lat, lon, cog, sog, duration) :
			dist = (sog / 3600.0) * duration
			dlat = (dist * sind(90.0-cog) / 60.0) # In latitude, 1NM = 1'
			dlon = (dist * cosd(90.0-cog) * cosd(lat) / 60.0) # In longitude, 1NM = 1' * cos(lat)
			return lat+dlat, lon+dlon

			if __name__ == '__main__':
			# Connect to VESPER XB-8000
			s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
			s.connect(("192.168.15.1",39150))

			sendNMEA(s, '$ECRMB,A,0.002,R,,POV,4302.541,N,00559.198,E,3.540,129.787,0.020,V')
			sendNMEA(s, '$ECAPB,A,A,0.002,R,N,V,V,129.659,T,POV,129.787,T,129.787,T')

mux0183/lib/nmea.py
00c1ab0d47c9master

nmea.py
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