====== NMEA 183 ====== ===== Standard Sentences ===== A talker typically sends a group of sentences at intervals determined by the unit's update rate, but generally not more often than once per second. Characters following the "*" are a checksum. Checksums are optional for most sentences, according to the standard. ==== APB ==== Autopilot format B APB,A,A,0.10,R,N,V,V,011,M,DEST,011,M,011,M A Loran-C blink/SNR warning A Loran-C cycle warning 0.10 cross-track error distance R steer Right to correct (or L for Left) N cross-track error units - nautical miles V arrival alarm - circle V arrival alarm - perpendicular 011,M magnetic bearing, origin to destination DEST destination waypoint ID 011,M magnetic bearing, present position to destination 011,M magnetic heading to steer (bearings could be given in True as 033,T) (note: some pilots, Roberston in particular, misinterpret "bearing from origin to destination" as "bearing from present position to destination". This apparently results in poor performance if the boat is sufficiently off-course that the two bearings are different.) ==== BOD ==== Bearing - origin to destination waypoint BOD,045.,T,023.,M,DEST,START 045.,T bearing 045 True from "START" to "DEST" 023.,M breaing 023 Magnetic from "START" to "DEST" DEST destination waypoint ID START origin waypoint ID ==== BWC ==== Bearing and distance to waypoint - great circle BWC,225444,4917.24,N,12309.57,W,051.9,T,031.6,M,001.3,N,004*29 225444 UTC time of fix 22:54:44 4917.24,N Latitude of waypoint 12309.57,W Longitude of waypoint 051.9,T Bearing to waypoint, degrees true 031.6,M Bearing to waypoint, degrees magnetic 001.3,N Distance to waypoint, Nautical miles 004 Waypoint ID ==== BWR ==== Bearing and distance to waypoint - rhumb line (format same as BWC) ==== DBT ==== Depth below transducer DBT,0017.6,f,0005.4,M 0017.6,f 17.6 feet 0005.4,M 5.4 Metres ==== GGA ==== Global Positioning System Fix Data GGA,123519,4807.038,N,01131.324,E,1,08,0.9,545.4,M,46.9,M, , *42 123519 Fix taken at 12:35:19 UTC 4807.038,N Latitude 48 deg 07.038' N 01131.324,E Longitude 11 deg 31.324' E 1 Fix quality: 0 = invalid 1 = GPS fix 2 = DGPS fix 08 Number of satellites being tracked 0.9 Horizontal dilution of position 545.4,M Altitude, Metres, above mean sea level 46.9,M Height of geoid (mean sea level) above WGS84 ellipsoid (empty field) time in seconds since last DGPS update (empty field) DGPS station ID number ==== GLL ==== Geographic position, Latitude and Longitude GLL,4916.45,N,12311.12,W,225444,A 4916.46,N Latitude 49 deg. 16.45 min. North 12311.12,W Longitude 123 deg. 11.12 min. West 225444 Fix taken at 22:54:44 UTC A Data valid (Garmin 65 does not include time and status) ==== GSA ==== GPS DOP and active satellites GSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39 A Auto selection of 2D or 3D fix (M = manual) 3 3D fix 04,05... PRNs of satellites used for fix (space for 12) 2.5 PDOP (dilution of precision) 1.3 Horizontal dilution of precision (HDOP) 2.1 Vertical dilution of precision (VDOP) DOP is an indication of the effect of satellite geometry on the accuracy of the fix. ==== GSV ==== Satellites in view GSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75 2 Number of sentences for full data 1 sentence 1 of 2 08 Number of satellites in view 01 Satellite PRN number 40 Elevation, degrees 083 Azimuth, degrees 46 Signal strength - higher is better There my be up to three GSV sentences in a data packet ==== HDM ==== Heading, Magnetic HDM,235.,M HDM Heading, Magnetic 235.,M Heading 235 deg. Magnetic (HDG, which includes deviation and variation, is recommended instead) ==== HSC ==== Command heading to steer HSC,258.,T,236.,M 258.,T 258 deg. True 236.,M 136 deg. Magnetic ==== MTW ==== Water temperature, Celcius MTW,11.,C 11.,C 11 deg. C ==== R00 ==== List of waypoint IDs in currently active route R00,MINST,CHATN,CHAT1,CHATW,CHATM,CHATE,003,004,005,006,007,,,*05 (This sentence is produced by a Garmin 65, but is not listed in Version 2.0 of the standard. The standard lists RTE for this purpose.) ==== RMB ==== Recommended minimum navigation information (sent by nav. receiver when a destination waypoint is active) RMB,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 ==== RMC ==== Recommended minimum specific GPS/Transit data RMC,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 = OK, 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, True 191194 Date of fix 19 November 1994 020.3,E Magnetic variation 20.3 deg East *68 mandatory checksum ==== RTE ==== Waypoints in active route RTE,2,1,c,0,W3IWI,DRIVWY,32CEDR,32-29,32BKLD,32-I95,32-US1,BW-32,BW-198*69 2 two sentences for full data 1 this is sentence 1 of 2 c c = complete list of waypoints in this route w = first listed waypoint is start of current leg 0 Route identifier W3IWI... Waypoint identifiers ==== VHW ==== Water speed and heading VHW,259.,T,237.,M,05.00,N,09.26,K 259.,T Heading 259 deg. True 237.,M Heading 237 deg. Magnetic 05.00,N Speed 5 knots through the water 09.26,K Speed 9.26 KPH ==== VWR ==== Relative wind direction and speed VWR,148.,L,02.4,N,01.2,M,04.4,K 148.,L Wind from 148 deg Left of bow 02.4,N Speed 2.4 Knots 01.2,M 1.2 Metres/Sec 04.4,K Speed 4.4 Kilometers/Hr ==== VTG ==== Track made good and ground speed VTG,054.7,T,034.4,M,005.5,N,010.2,K 054.7,T True track made good 034.4,M Magnetic track made good 005.5,N Ground speed, knots 010.2,K Ground speed, Kilometers per hour ==== WCV ==== Waypoint Closure Velocity ==== WDC ==== Distance to Waypoint ==== WDR ==== Waypoint Distance, Rhumb Line ==== WPL ==== waypoint location WPL,4917.16,N,12310.64,W,003*65 4917.16,N Latitude of waypoint 12310.64,W Longitude of waypoint 003 Waypoint ID When a route is active, this sentence is sent once for each waypoint in the route, in sequence. When all waypoints have been reported, GPR00 is sent in the next data set. In any group of sentences, only one WPL sentence, or an R00 sentence, will be sent. ==== XTE ==== Cross track error, measured XTE,A,A,0.67,L,N A General warning flag V = warning (Loran-C Blink or SNR warning) A Not used for GPS (Loran-C cycle lock flag) 0.67 cross track error distance L Steer left to correct error (or R for right) N Distance units - Nautical miles ==== XTR ==== Cross-Track Error - Dead Reckoning XTR,0.67,L,N 0.67 cross track error distance L Steer left to correct error (or R for right) N Distance units - Nautical miles