nmea_cksum marker output with hash sign
nmea_cksum marker output with hash sign

test code:
cat  DATA00*.DAT  | ../nmea_cksum | grep "#"

OpenSeaMap/logger-oseam-0183,OpenSeaMap/logger-oseam-0183,OpenSeaMap/logger-oseam-0183,OpenSeaMap/logger-oseam-0183,OpenSeaMap/logger-oseam-0183,OpenSeaMap/logger-oseam-0183