Goniometer : CLS RXG-234

The Argos Platform direction finder

platform finder goniometer

The CLS goniometer has been designed by CLS to specifically allow users to find active Argos platforms in the field. Depending on the altitude and the reception conditions the goniometer can detect all transmitting platforms within a radius of 100 km or more.

Download the RXG-234 Brochure

This highly sensitive direction finder allows field recovery of Argos platforms by detecting:
  • The direction towards the Argos platform
  • The signal power of the Argos transmitter
  • The GNSS positions transmitted by the platform (if any)

System capabilities

  • Argos demodulated messages and PTT reception angle are displayed
  • Provides direction and distance estimation of the transmitter
  • Real-time decoding of GPS positions transmitted by the platform (if any)*
  • All received data is stored and can be downloaded via USB


  • Full compatibility with the current Argos constellation, Argos-4 and future KINEIS constellation
  • Extended Internal Memory save up to 200 000 messages internally (shared between all favorites platforms)
  • All to Favorite mode to automatically consider any platform received as a favorite (internally recorded)
  • Proximity & Narrow band modes for last meters and difficult conditions


Sunfish tagged with an X-Tag at Eastern Taiwan. Credits Tuna and Billfish Tagging Project in Taiwan

25.09.2018 Animal tracking applications Finding sunfish’s pop-up Argos tag with Goniometer

The Tuna and Billfish Tagging Project in Taiwan uses Argos satellite telemetry pop-up tags to track pelagic species. A total of five tags were recently retrieved using Argos Goniometer, including three tags on amberjacks, one on a big-eye tuna and one on a sunfish. Two of them were found…
Glider 416

12.01.2017 Goniometer Finding CSIRO’s Glider 416 following a shark attack

On January 21st 2016, Rob Gregor (CSIRO) and his team from the Australian Institute of Marine Science (AIMS) deployed the Slocum glider 416 (Amy) as part of the eReefs project to observe the water around the northern Great Barrier Reef. The plan was for the deployment to start in Palm Passage and sample to include the areas of routine ship borne CTD measurements.
Finding a glider in the Southern Ocean

01.02.2014 Goniometer Finding a glider in the Southern Ocean

In February 2014, a research team from the University of East Anglia deployed two Seagliders in the Amundsen Sea, to study the water salinity, temperature, and oxygen levels. The gliders use the Iridium satellite communication system for data relay, but the University team systematically attaches a robust SPOT-5 Argos tag to the antenna, in case of any malfunction with the Iridium system. After several days, communication with one of the two gliders became difficult.

06.12.2016 Argos news & events Undersea moorings recovered after 13 years of submersion thanks to Argos

In February 2016, Jean-Louis Lamy (from LAMY Marine Consulting) was tasked with recovering four subsurface moorings off Crozet Island, that had been deployed more than 13 years ago. The moorings, located at 400 meters below the sea surface,  were equipped with Argos beacons to facilitate recovery when surfacing. For the…
Argos goniometer - Rick Goetz

18.11.2016 Goniometer 100% of our pop-up tags recovered thanks to the Goniometer

Rick Goetz (NOAA NWFSC) leased the Argos Goniometer in May 2016 in order to recover pop-up satellite tags (model: SeaTag-MOD from Desert Star Systems). Using the Argos Goniometer, Rick noted, “We got all the tags we went after….there were 4 tags in the open ocean about 25-30 miles off…
glider coral sea argos goniometer

03.09.2015 Goniometer Finding a glider in the Coral Sea

A glider deployed in the Coral Sea in May 2015 by the IMOS (Australia) developed technical problems, most likely due to a faulty memory card. The glider was recovered in September 2015, thanks the RXG-134.”
Find a tag at sea with goniometer

03.09.2015 Animal tracking applications Find a tag at sea with goniometer

“…the goniometer worked perfectly for chasing down PSATs on their pop-up date in Glacier Bay! We were able to recover 4/5 tags that popped up, including 1 Desert Star tag that was missing an antenna! The remaining tag is another Desert Star tag that is not transmitting frequently enough to provide an Argos location, it is possible that this tag is missing its antenna as well...." Credit photo : Amanda Compton
Tracking Black-tailed Godwits (Limosa limosa)

03.06.2015 Goniometer Tracking Black-tailed Godwits (Limosa limosa)

The Conservation Ecology Group of the Groningen Institute for Evolutionary Life Sciences used a goniometer  to track both dead and living Black-tailed Godwits (Limosa limosa) in their long-term demographic project on this species .
Tracking great spotted cuckoos

23.02.2014 Goniometer Tracking great spotted cuckoos

“In May of 2013, we began tracking several Great Spotted Cuckoos with Argos 5g solar PTTs. In July of 2013, the position of one of them stabilized in a location 50 kms away from its capture area and we believed it had died. The PTT still transmitted from time to time but it was impossible for us to find it with the information provided by these transmissions... Considering the investment that is made in our PTTs, the goniometer seems to be a good tool to ensure we get as much use out of them as possible...