Underwater work techniques

Table 2-23 Navigation Summary

Type

Instrument

When Used

Comments

Subsurface

Visual

ROV Video Camera

Clear, shallow water. Reference points in water or on bottom.

Vehicle location not tracked.

Bearing

Vehicle Compass

Transit to known position and for orientation.

Vehicle location not tracked. Affected by water current (drift).

Acoustic

Ultra-Shore Baseline (USBL)

Long distance, deep water, or where precise positioning is needed.

Vehicle and object locations tracked. Uses remote sound sources.

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