Atlas PT Technical Manual42repeater, it is the signal lever of the repeated message.14 Speed The speed of the device in km/hour, 0-25515 Heading The heading of the device 0-360 degrees16 Status Status flags received from the device. Not all productssupport generating all status flag codes.NULL means no alerts.“P” means a proximity alert.“M” means man-down alert“A” General alert, usually due to pressing an alert button“C” Critical alert, usually due to pressing and holdingalert button“D” Alert acknowledge, set by the ACK1 command afterthe unit enters alert“T” External battery removed flag, indicating that abattery was attached but was removed for longer thanfive minutes“I” Impact alert“V” Vibration“S” Service required on product17 Spare A spare field. May be used for UTC date in the future.Typically NULL.18 * The “*” NMEA end-of-message identifier.19 Checksum The NMEA 0183 checksum.Example Sentence:$PRAVE,0001,0001,3308.9051,-11713.1164,195348,1,10,168,31,8.1,3,-83,0,0,,*66This example shows a unit at 33° 8.9051 north latitude and 117° 13.1164 eastlongitude. It is not moving (0 speed). Its signal strength was -83dBm. Its altitude is 168meters.12. MaintenanceThe following maintenance precautions are required to keep the GPS transponderunder manufacturer’s warranty.