Mk II
The Mk II is the least-expensive variant of the ROVLe lineup. It is designed to be economical for users who are able to accommodate the requirement of exposing both the Receiver and the Transmitter to GPS/GNSS signals at the start of a mission and periodically (every hour two) during the mission. Between exposures to GNSS, the timebases may slowly drift out of sync. This manifests itself as a slowly growing error in slant range (on the order of one meter per hour).
The Mk II transmitter requires power from the host ROV. Otherwise, it is independent from the rest of the ROV setup.
By default, the Mk II Receiver communicates with its host PC using a USB connection. The USB connection enumerates as a COM port. By specification, the maximum length of a USB cable is 5 meters (about 16 feet). The length can usually be extended using an active powered USB cable, as long as the powered cable is low-enough resistance to properly power the Receiver. It is also possible to use a power-over-Ethernet connection, which can be much longer. Contact the factory for details.
When a Mk II transmitter is properly connected, it will click when the internal GNSS receiver acquires satellites and syncs the internal timebase. The transmitter must be out of the water for this to happen. It is not possible to tell if the Mk II receiver is properly connected without looking a software user interface.
Autosync (Mk II Only)
Mk II Autosync uses GPS and/or GNSS signals to eliminate the need to calibrate the crystal oscillators and to manually sync the distance between units at mission start-up. More information is in the following sections:
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