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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Mark_M
If you are talking about the string after PCAS04
$PMTK�PMTK�$GPTXT�$GNRMC�$GPRMC�$GPGGA�$GPGSV�,0�,1,25,180000,60000�,1,3000,12000,18000,72000�,0,1,0,1,0,5,0,0,0,0,0,0,0,0,0,0,0,0��$PCAS02,1000�$PCAS03,1,0,0,0,1,0,0,0�$PCAS03,0,0,0,1,0,0,0,0�$PCAS04,3�,091926.000,3113.3166,N,12121.2682,E,0.51,09,0.9,36.9,M,7.9,M,,000056�,961639.00,A,2458.21111,N,11838.31444,E,0.18,,091217,,,A,V*,,*
I do not think it is a command as is. It does not have any prefix. It may be a constant for default value for something. To find it out we need to sniff traffic.
Also, these $PMTK tell me that it is for MTK chip.