Hydrography - Depth Determination
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the Single Beam Echo Sounders Need Two Calibrations:
- 1. Draft
- 2. Speed of Sound
Bar Check Calibration:
Lowering a bar to a known depth to determine velocity.
Elevation change in respect to speed of the of the vessel.
Change in trim (Bow up/ Stern down) due to the vessel's speed
Lines perpendicular to the primary lines with spacing up to 15 times the primary. Used to check consistency of survey.
An area that is shallower than the its surroundings.
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