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Packet decoder

Paste one raw APRS-IS line to see what every part of it means, and exactly where and why a line that does not decode goes wrong.

Try a position, a Mic-E position, a weather report, a message, a broken line

Mic-E position Decoded without problems

N0CALL-9>SVQU4P,WIDE1-1,qAR,N0CALL-10:`r=gl#6k/`"5T}_4

Header

  • Source N0CALL-9 The station that sent it N0CALL-9
  • SSID -9: by custom a main mobile, usually able to message The APRS SSID list is a custom, not a rule. -9
  • Destination Carries the Mic-E latitude and message bits (read under Mic-E) SVQU4P
  • Path Heard on the air by N0CALL-10, then passed to APRS-IS (qAR) WIDE1-1,qAR,N0CALL-10
  • Digipeaters None used: heard directly TNC2 writes one * after the last hop used; every hop before it was used too. WIDE1-1
  • Hop 1 WIDE1-1: asks for up to 1 hop, 1 still to go (not used) WIDE1-1
  • q construct qAR: Heard on the air by the igate named next, which sent it to APRS-IS on a verified login. qAR
  • Igate N0CALL-10 N0CALL-10: the igate that heard it on the air N0CALL-10

Data type

  • Data type Mic-E, current format `

Mic-E

  • Destination character 1 'S': latitude digit 3; message bit A = 1 (standard) S
  • Destination character 2 'V': latitude digit 6; message bit B = 1 (standard) V
  • Destination character 3 'Q': latitude digit 1; message bit C = 1 (standard) Q
  • Destination character 4 'U': latitude digit 5; north U
  • Destination character 5 '4': latitude digit 4; longitude +0° 4
  • Destination character 6 'P': latitude digit 0; west P
  • Latitude 36.256667° N (36° 15.40′ as sent) SVQU4P
  • Message M0: Off Duty (bits ABC = 111, standard) SVQ
  • Longitude degrees 'r': 114 − 28 = 86: 86° r
  • Longitude minutes '=': 61 − 28 = 33: 33′ =
  • Longitude hundredths 'g': 103 − 28 = 75: .75′ g
  • Longitude 86.562500° W r=g
  • Coordinates 36.25667, -86.56250 r=g
  • Speed byte (SP) 'l': 108 − 28 = 80: hundreds and tens of knots l
  • Speed and course byte (DC) '#': 35 − 28 = 7: knots 0, course hundreds 7 #
  • Course byte (SE) '6': 54 − 28 = 26: course tens and units 6
  • Speed 0 knots (SP × 10 + DC ÷ 10, less 800) l#
  • Course 326° (DC's units × 100 + SE, less 400) #6
  • Symbol table '/': the primary table /
  • Symbol 'k': Truck k

Comment

  • Mic-E type byte '`': the station can do messages; a device code may end the comment `
  • Altitude 152 meters (base 91 ""5T" less 10,000, then '}') "5T}

Device

  • Runs Yaesu FTM-500D _4
  • Maker Yaesu _4
  • Model FTM-500D _4
  • Kind Rig _4
  • Matched Mic-E code _4 (the comment's last two characters) in the APRS device identification database _4