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2
Fixed
GPS satellites
Nav-aided speed
(Pseudo ground tracking speed)
Water tracking speed
Ground tracking speed
Near-surface layer
:Base of measurement
Figure 2
Tide
Tide is movement of watermass at a particular depth.
To know absolute tide (speed on ground), the following two
data are required:
1
Ship’s speed and course based on ground
2
Ship’s speed and course based on measuring layer (A)
Absolute tide is, then, given as a difference of these two speed
vectors.
Absolute Tide =
1
–
2
Fixed
Layer (A)
:Base of
measurement
2
1
Figure 3