$GPGST GPS Pseudorange Noise Statistics Example: $GPGST,024603.00,3.2,6.6,4.7,47.3,5.8,5.6,22.0*58 Field Example Comments Sentence ID $GPGST   UTC Time 024603.00 UTC time of associated GGA fix RMS deviation 3.2 Total RMS standard deviation of ranges inputs to the navigation solution Semi-major deviation 6.6 Standard deviation (meters) of semi-major axis of error ellipse Semi-minor deviation 4.7 Standard deviation (meters) of semi-minor axis of error ellipse Semi-major orientation 47.3 Orientation of semi-major axis of error ellipse (true north degrees) Latitude error deviation 5.8 Standard deviation (meters) of latitude error Longitude error deviation 5.6 Standard deviation (meters) of longitude error Altitude error deviation 22.0 Standard deviation (meters) of latitude error Checksum *58     $GPGSV GPS Satellites in view eg. $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74 $GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74 $GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D $GPGSV,1,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*62 1 = Total number of messages of this type in this cycle 2 = Message number 3 = Total number of SVs in view 4 = SV PRN number 5 = Elevation in degrees, 90 maximum 6 = Azimuth, degrees from true north, 000 to 359 7 = SNR, 00-99 dB (null when not tracking) 8-11 = Information about second SV, same as field 4-7 12-15= Information about third SV, same as field 4-7 16-19= Information about fourth SV, same as field 4-7 $GPHDT Heading, True. Actual vessel heading in degrees Ture produced by any device or system producing true heading. $--HDT,x.x,Tx.x = Heading, degrees True $GPMSK Control for a Beacon Receiver $GPMSK,318.0,A,100,M,2*45 where: 318.0 Frequency to use A Frequency mode, A=auto, M=manual 100 Beacon bit rate M Bitrate, A=auto, M=manual 2 frequency for MSS message status (null for no status) *45 checksum $GPMSS Beacon Receiver Status Example 1: $GPMSS,55,27,318.0,100,*66 where: 55 signal strength in dB 27 signal to noise ratio in dB 318.0 Beacon Frequency in KHz 100 Beacon bitrate in bps *66 checksum Example 2: $GPMSS,0.0,0.0,0.0,25,2*6D Field Example Comments Sentence ID $GPMSS   Signal strength 0.0 Signal strength (dB 1uV) SNR 0.0 Signal to noise ratio (dB) Frequency 0.0 Beacon frequency (kHz) Data rate 25 Beacon data rate (BPS) Unknown field 2 Unknown field sent by GPS receiver used for test Checksum *6D     $GPR00 List of waypoint IDs in currently active route eg1. $GPR00,EGLL,EGLM,EGTB,EGUB,EGTK,MBOT,EGTB,,,,,,,*58 eg2. $GPR00,MINST,CHATN,CHAT1,CHATW,CHATM,CHATE,003,004,005,006,007,,,*05 List of waypoints. This alternates with $GPWPL cycle which itself cycles waypoints. $GPRMA Recommended minimum specific Loran-C data eg. $GPRMA,A,lll,N,lll,W,x,y,ss.s,ccc,vv.v,W*hh A = Data status lll = Latitude N = N/S lll = longitude S = W/E x = not used y = not used ss.s = Speed over ground in knots ccc = Course over ground vv.v = Variation W = Direction of variation E/W hh = Checksum $GPRMB Recommended minimum navigation information (sent by nav. receiver when a destination waypoint is active) eg1. $GPRMB,A,0.66,L,003,004,4917.24,N,12309.57,W,001.3,052.5,000.5,V*0B A Data status A = OK, V = warning 0.66,L Cross-track error (nautical miles, 9.9 max.), steer Left to correct (or R = right) 003 Origin waypoint ID 004 Destination waypoint ID 4917.24,N Destination waypoint latitude 49 deg. 17.24 min. N 12309.57,W Destination waypoint longitude 123 deg. 09.57 min. W 001.3 Range to destination, nautical miles 052.5 True bearing to destination 000.5 Velocity towards destination, knots V Arrival alarm A = arrived, V = not arrived *0B mandatory checksum eg2. $GPRMB,A,4.08,L,EGLL,EGLM,5130.02,N,00046.34,W,004.6,213.9,122.9,A*3D 1 2 3 4 5 6 7 8 9 10 11 12 13 1 A validity 2 4.08 off track 3 L Steer Left (L/R) 4 EGLL last waypoint 5 EGLM next waypoint 6 5130.02 Latitude of Next waypoint 7 N North/South 8 00046.34 Longitude of next waypoint 9 W East/West 10 004.6 Range 11 213.9 bearing to waypt. 12 122.9 closing velocity 13 A validity 14 *3D checksum eg3. $GPRMB,A,x.x,a,c--c,d--d,llll.ll,e,yyyyy.yy,f,g.g,h.h,i.i,j*kk 1 = Data Status (V=navigation receiver warning) 2 = Crosstrack error in nautical miles 3 = Direction to steer (L or R) to correct error 4 = Origin waypoint ID# 5 = Destination waypoint ID# 6 = Destination waypoint latitude 7 = N or S 8 = Destination waypoint longitude 9 = E or W 10 = Range to destination in nautical miles 11 = Bearing to destination, degrees True 12 = Destination closing velocity in knots 13 = Arrival status; (A=entered or perpendicular passed) 14 = Checksum $GPRMC Recommended minimum specific GPS/Transit data eg1. $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62 eg2. $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68 225446 Time of fix 22:54:46 UTC A Navigation receiver warning A = Valid position, V = Warning 4916.45,N Latitude 49 deg. 16.45 min. North 12311.12,W Longitude 123 deg. 11.12 min. West 000.5 Speed over ground, Knots 054.7 Course Made Good, degrees true 191194 UTC Date of fix, 19 November 1994 020.3,E Magnetic variation, 20.3 deg. East *68 mandatory checksum eg3. $GPRMC,220516,A,5133.82,N,00042.24,W,173.8,231.8,130694,004.2,W*70 1 2 3 4 5 6 7 8 9 10 11 12 1 220516 Time Stamp 2 A validity - A-ok, V-invalid 3 5133.82 current Latitude 4 N North/South 5 00042.24 current Longitude 6 W East/West 7 173.8 Speed in knots 8 231.8 True course 9 130694 Date Stamp 10 004.2 Variation 11 W East/West 12 *70 checksum eg4. for NMEA 0183 version 3.00 active the Mode indicator field is added $GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,m*hh Field # 1 = UTC time of fix 2 = Data status (A=Valid position, V=navigation receiver warning) 3 = Latitude of fix 4 = N or S of longitude 5 = Longitude of fix 6 = E or W of longitude 7 = Speed over ground in knots 8 = Track made good in degrees True 9 = UTC date of fix 10 = Magnetic variation degrees (Easterly var. subtracts from true course) 11 = E or W of magnetic variation 12 = Mode indicator, (A=Autonomous, D=Differential, E=Estimated, N=Data not valid) 13 = Checksum $GPRTE Routes eg. $GPRTE,2,1,c,0,PBRCPK,PBRTO,PTELGR,PPLAND,PYAMBU,PPFAIR,PWARRN,PMORTL,PLISMR*73 $GPRTE,2,2,c,0,PCRESY,GRYRIE,GCORIO,GWERR,GWESTG,7FED*34 1 2 3 4 5 .. Number of sentences in sequence Sentence number 'c' = Current active route, 'w' = waypoint list starts with destination waypoint Name or number of the active route onwards, Names of waypoints in Route $GPTRF Transit Fix Data Time, date, position, and information related to a TRANSIT Fix. $--TRF,hhmmss.ss,xxxxxx,llll.ll,a,yyyyy.yy,a,x.x,x.x,x.x,x.x,xxxhhmmss.ss = UTC of position fix xxxxxx = Date: dd/mm/yy llll.ll,a = Latitude of position fix, N/S yyyyy.yy,a = Longitude of position fix, E/W x.x = Elevation angle x.x = Number of iterationsx.x = Number of Doppler intervals x.x = Update distance, nautical miles x.x = Satellite ID

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