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GpsMap 276C Advanced NMEA Setup
In the NMEA Setup of GpsMap76 and the Advanced NMEA Setup of GpsMap276C, there is a recommendation to not select all messages to be sent, since this could lead the time of transmission to exceeds 1 sec, which could impact the performance of the interface with some equipments, like autopilots. After the 3.21 upgrade, wich included the 3 new messages (BWC, XTE and VTG) that I have requested to be included in the Map276C, the maximum batch would have about 16 messages like this: $GPRMC,010003,A,1248.7047,S,03827.5797,W,0.0,94.9, 290505,23.0,W,A*03 $GPRMB,A,0.04,L,AIC,BA01,1248.4128,S,03827.6978,W, 0.314,338.4,,V,A*33 $GPGGA,010003,1248.7047,S,03827.5797,W,1,11,0.8,1. 0,M,-10.5,M,,*66 $GPGSA,A,3,01,03,06,,14,15,16,18,19,21,22,25,1.5,0 .8,1.3*3B $GPGSV,3,1,12,01,43,333,54,03,43,237,49,06,05,030, 43,09,02,120,00*7C $GPGSV,3,2,12,14,86,032,47,15,46,140,45,16,18,315, 47,18,19,143,49*70 $GPGSV,3,3,12,19,21,221,35,21,29,091,49,22,39,174, 43,25,17,000,50*70 $GPGLL,1248.7047,S,03827.5797,W,010003,A,A*43 $GPBOD,345.6,T,8.6,M,BA01,AIC*04 $GPBWC,010003,1248.4128,S,03827.6978,W,338.4,T,1.5 ,M,0.314,N,BA01,A*61 $GPVTG,94.9,T,117.9,M,0.0,N,0.0,K,A*19 $GPXTE,A,A,0.04,L,N,A*07 $PGRME,6.7,M,9.5,M,11.6,M*15 $PGRMZ,3,f,3*18 $PGRMM,WGS 84*06 $GPWPL,1249.4946,S,03830.9732,W,USIB*4F This batch has 742 characters, and thus, the time to send it at 4800 bps is: 742*8/4800= 1.23 sec, which would exceed the recommended maximum of 1 sec. Excluding all the optional messages, as allowed in the NMEA setup, (GSA, GSV, WPL , RME, RMZ and RMM) the batch would consist of 8 messages as follows: $GPRMC,010003,A,1248.7047,S,03827.5797,W,0.0,94.9, 290505,23.0,W,A*03 $GPRMB,A,0.04,L,AIC,BA01,1248.4128,S,03827.6978,W, 0.314,338.4,,V,A*33 $GPGGA,010003,1248.7047,S,03827.5797,W,1,11,0.8,1. 0,M,-10.5,M,,*66 $GPGLL,1248.7047,S,03827.5797,W,010003,A,A*43 $GPBOD,345.6,T,8.6,M,BA01,AIC*04 $GPBWC,010003,1248.4128,S,03827.6978,W,338.4,T,1.5 ,M,0.314,N,BA01,A*61 $GPVTG,94.9,T,117.9,M,0.0,N,0.0,K,A*19 $GPXTE,A,A,0.04,L,N,A*07 This batch has 412 characters, and thus, the time to send it at 4800 bps is: 412*8/4800= 0.69 sec, well below the recommended maximum of 1 sec. So, I remind the owners of Map276C to pay attention to this setup, letting the unit send only the optional messages if needed; selecting a batch between this two extremes would be advised. Pascal |
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