Self-Contained Submersible Iridium MicroBeacon
XMI-11K Iridium microbeacon

The XMI Subsurface Iridium Satellite Mooring Location Beacon continuously monitors for un-planned or accidental release of subsurface instrument moorings. The XMI makes use of the bi-directional, global, real time Iridium Satellite Short Burst Data (SBD) network in combination with GPS position location.

The XMI’s tubular design allows it to be easily retrofitted into existing subsurface flotation configurations, such as syntactic foam. Inside the XMI is a 9603 Iridium Satellite Short Burst Data radio transceiver, a specialized low power Xeos digital controller with GPS, Iridium antenna, GPS antenna and battery package. XMI is intended for subsurface deployments and is intended for deployments up to 11,000 m below sea level. 

The optional Remote Head version, the XMI-RH, connects the battery pack to the electronics via a 6-foot, 4-Pin undersea cable for more precise weight balancing and installation of antennas on subsea platforms. The XMI-RH is suitable for deployments of up to 7500 meters below sea level.

After being activated, the XMI can be deployed at the depths of up to 11,000 m. The internal solid-state sensor is triggered when the XMI surfaces and immediately begins sending location messages as per the user settings. The internal battery pack provides over 1 1/2 years of subsurface deployment followed by up to 30 days of message transmissions. Operators can communicate with the XMI once it has surfaced via Iridium using XeosOnline. Optionally, email commands can be sent directly to the XMI. Status information can be obtained, including the health of the GPS system and battery voltage. Timings can be changed, with defaults being one message every 3 hours. If you need to make a change to the settings, the XMI will receive the command on its next Iridium message check. The XMI will continue to send position messages based on its timings, until it is manually turned off upon retrieval or the battery pack drops below the minimum operating voltage of 7 Volts.

  • 1407g in air, 987g in water
  • Iridium Comms
  • 6 AA-cell Alkaline batteries
  • Deployment time: 547 days below the surface, 92 days at the surface (3 hour position messages)
  • GPS Location & transmission of data
  • Bluetooth Low Energy (BTLE)
  • All titanium with a glass dielectric antenna component
  • Submersible to 11,000m