Appendix-24
・DPT – Depth
$--DPT, x.x, x.x, x.x*hh<CR><LF>
1 2 3
1：Water depth relative to the transducer, in metres
2：Offset from transducer, in metres (see Notes 1 and 2)
3：Maximum range scale in use
NOTE 1 “positive” = distance from transducer to water line; “-“ = distance from transducer to keel.
NOTE 2 For IEC applications, the offset should always be applied so as to provide depth relative to the keel.
・MTW – Water temperature
$-- MTW, x.x, C*hh<CR><LF>
1 2
1：Temperature, degrees C
2：Temperature, degrees C
・CUR – Water current layer – Multi-layer water current data
$--CUR,A,x,x.x,x.x,x.x,a,x.x,x.x,x.x,a,a*hh<CR LF>
1
2 3 4 5 6 7 8 9 1011
1：Validity of the data, A = Valid, V = not valid
2：Data set number, 0 to 9 (see Note 1)
3：Layer number (see Note 2)
4：Current depth in metres
5：Current direction in degrees
6：Direction reference in use, True/Relative T/R
7：Current speed in knots
8：Reference layer depth in metres (see Note 3)
9：Heading
10：Heading reference in use, True/Magnetic T/M
11：Speed reference (see Note 4)
B: Bottom track
W: Water track
P: Positioning system
NOTE 1 The data set number is used to identify multiple sets of current data produced in one measurement
instance. Each measurement instance may result in more than one sentence containing current data measurements
at different layers, all with the same data set number. This is used to avoid the data measured in another instance to
be accepted as one set of data.
NOTE 2 The layer number identifies which layer the current data measurements were made from. The number of
layers that can be measured varies by device. The typical number is between 3 and 32, though many more are
possible.
NOTE 3 The current of each layer is measured according to this reference layer, when the speed reference field is
set to “water track”, or the depth is too deep for bottom track.
NOTE 4 “Speed reference” identifies the method of ship speed used for measuring the current speed.
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