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OpenTracker+ (OT+ or OT1+) - APRS Tracker from Argent Data Systems.

The OpenTracker+ is an APRS tracker that can also receive data from other stations and has waypoint output capability. Use the OT1+ to report position, course and speed, time, and altitude when connected to a GPS -- not just from a vehicle, but anything, including a bicycle, weather balloon, or backpack. Or, use the OT1+ to encode and transmit data from a supported weather station. The tracker will also report telemetry from its onboard temperature and voltage sensors, and an external counter input can report a cumulative total of counter events or the number of events since last transmission. The OpenTracker+ replaces the OT1x and OT1m series. The OT1+ added waypoint output capability, increased program space and RAM, and a simplified hardware design. Available as a kit or fully assembled.


  • APRS telemetry output
  • Fixed location operation for telemetry with no GPS
  • NMEA waypoint output
  • Dual configuration profiles with flexible selection
  • On-board temperature and voltage sensors
  • Supports 1-wire and Peet Bros WX stations
  • Drive an external relay for radio power control
  • Supports 1200 and 300 baud AFSK operation
  • PSK31 support for PropNet^31 Operation
  • Base91 compressed positions with 1-foot resolution
  • SmartBeaconing™ for adaptive beacon rates
  • Digital event counter, cumulative or since last transmission
  • Free firmware upgrades directly from the website, no special hardware needed
  • Source code released under Modified BSD license


  • Voltage: DC 6.5 to 28V
  • Current: 8 mA idle, 20 mA transmitting. Max 200 mA @ 5 V available for GP
  • Modes: 1200 bps AFSK (send and receive). 300 bps AFSK, PSK31 (send only)
  • Radio Connector: DB9 female (Kantronics pinout)
  • Serial Connector: DB9 male (RS-232 DTE configuration)
  • Dimensions: 2.5" x 1.6" x 0.75"
  • GPS Interface: NMEA in/out


  • Kit - 30$
  • Assembled - 40$

See also[edit]