Subsea Positioning

Photo courtesy of International Submarine Engineering

USBL (Ultra Short Base Line), SBL (Short Base Line), and LBL (Long Base Line) are all acoustic positioning systems, designed to help establish relative and absolute position underwater.  Due to their use of acoustic technology, all three systems depend upon an accurate measurement of sound velocity, although the degree of dependence varies from system type to system type.

USBL - Ultra Short Base Line

USBL arrays are generally easy to install, and hence are often used on small boats or buoys.

SBL - Short Base Line

SBL arrays are typically fitted to ships and platforms.

LBL - Long Base Line

LBL arrays use transponder arrays with transponder separations from 100m to several kilometers.

Subsea Positioning Products