Key Features Type 7842

Depth rated to 4,000 metres

Provides ranges up to 3km and positioning accuracy of 0.15m

Sonardyne LBL and LUSBL compatible

RS232/ RS485 full or half duplex interface for fast position updates

Compact and rugged design

Key Features Type 7860

Type 7860 EHF Mini RovNav

Depth rated to 2,000 metres

Provides ranges up to 1km and positioning accuracy of 0.05m

Enables high accuracy LBL equipment to be used in deepwater

Integral depth and temperature sensors

Powered from ROV's umbilical

Datasheet

Mini RovNav Transceiver

Mini ROVNav is a compact, remote acoustic transceiver designed to accurately position deepwater, mobile targets such as ROVs and towfish.

The Type 7842 is a Medium Frequency (18-36 kHz) version which gives ranges up to 3kms and a positioning accuracy of 0.15m. The Type 7860 Extra High Frequency (50-110 kHz) Mini ROVNav enables relative positioning of accuracies 0.05m to be achieved with acoustic ranges of up to 1km.

Working within a Long BaseLine array, Mini ROVNav measures ranges to seabed transponders. Together with depth information, this data is digitally transmitted to the surface and combined with survey software to determine the position of the mobile relative to the array. The digital link (RS232 or RS485 full or half duplex) ensures that reliable communications with the Mini ROVNav can be maintained despite the use of increasingly long umbilical.

Mini ROVNav is compatible with all compatt commands thus allowing a relative calibration of a seabed array from the remote vehicle without the need for direct ranging or telemetry to the surface vessel. This enables high accuracy, short range EHF equipment to be used in deepwater.

When used with a Sonardyne USBL system, the Mini ROVNav can be configured as a USBL Responder or as a LBL transceiver to provide a complete acoustic positioning solution.