System Variants

There are two current variations of the system:

• Mk II Autosync. This unit automatically synchronizes the system timebases using GPS or GNSS. Synchronization requires both the transmitter and receiver to be (independently) exposed to GPS/GNSS signals at the start of the mission and periodically (every hour or two) during the mission. Additionally, Mk II autosync units can operate on either of two channels allowing two independent ROV systems in the same operating area. The autosync unit allows for multiple receivers to interoperate simultaneously with one transmitter on each channel.

• Mk III. This system is similar to a traditional ultra-short baseline (USBL) system. The transceiver sends an interrogation pulse to the transponder, which returns an answer pulse. Slant range is calculated from time of flight, so no timebase synchronization is needed and thus the system can remain submerged indefinitely. Only one Mk III transceiver can operate in an area at one time.

Transmitter Mk II

Receiver Mk II

Transponder Mk III.

Transceiver Mk III