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


searching for Argos tag with goniometer

26.09.2022 Animal tracking applications Lost shark tag found thanks to the Animal Telemetry Network and the Argos goniometer

Marcus Drymon, Assistant Extension Professor at Mississippi State University Marine Fisheries Specialist and Dr. Greg Skomal, an accomplished marine biologist who we interviewed for Shark Week, were recently able to recover a lost shark tag thanks to NOAA’s Animal Telemetry Network (ATN) and an Argos goniometer loaned…
a lake charr with an Argos archival tag

31.08.2022 Animal tracking applications Lake charr ecotypes’ habitats differ

Lake charrs are freshwater fish found in the Laurentian Great Lakes (North America), among others. They nearly disappeared, but restoration was successful at least in Lake Superior. Understanding the different habitats of the lake charr ecotypes can help in restoring them in all of the Great Lakes. Photo:…
Thomas Gray, CLS expert, holding a goniometer

07.04.2021 Goniometer Three Top Tips for using your Goniometer with Thomas Gray

Thomas Gray joined the Argos team in 2016 and has quickly become our go-to person on all things Goniometer. He brings ten years of sales and marketing experience in the underwater tech realm previously working for an Argos satellite tag manufacturer. Some of Thomas’ favorite activities…
Glider found with goniometer

26.03.2021 Argos news & events Lost Glider at sea found thanks to Argos and Goniometer

Gliders are valuable platforms in terms of equipment but also in terms of the vital information they collect. It is therefore not surprising that many of them are equipped with small Argos beacons in order to recover them in case of loss at sea. Currently, these Argos beacons…
Mahi-Mahi fish

29.01.2021 Animal tracking applications The Argos Goniometer recovers data of a tagged fish eaten by a predator

Scientists Chiang, Wei-Chuan (Riyar) & Shian-Jhong Lin, from Eastern Marine Biology Research Center of Fisheries Research Center, Taiwan and Michael K. Musyl from Pelagic Research Group LLC, have been studying the movement patterns and habitat preferences of Dolphinfish in Taitung. They recently recovered an Argos archival tag,…
great spotted cuckoo iStock

14.10.2019 Animal tracking applications Great spotted cuckoos tracked far from the nest by Argos

Cuckoos’ most well-known characteristic is the laying of their eggs in another species’ nest taking advantage of the care provided by these foster parents (brood parasitism). But some cuckoo species, such as great spotted cuckoos, are also migratory. Advancements in Argos satellite telemetry – especially miniaturization of Argos tags –…
IMOS glider

01.07.2019 Goniometer Glider recovery with Argos back-up tracking

Australia’s Integrated Marine Observing System (IMOS) is a national collaborative research infrastructure, supported by the Australian Government. The IMOS Ocean Gliders facility operates a fleet of autonomous underwater ocean gliders that undertake measurements from shelf and boundary currents in Australian…
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...