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Innovative Underwater Products
ID19: NMEA $SDDBT
String format:
$SDDBT,x.x,f,x.x,M,x.x,F*hh<CR><LF>
x.x,f, = distance in feet from the transducer face to the target.
x.x,M,= distance in meters from the transducer face to the target.
x.x,F = distance in fathoms from the transducer face to the target.
* = checksum delimeter
hh = checksum filed
<CR><LF> = end of sentence carriage return and line feed characters.
ID20: NMEA $SDDPT
String format:
$SDDPT,x.x,x.x*hh
First x.x = distance in meters from the transducer face to the target.
Second x.x = Offset from transducer (positive means distance from transducer to
water line, negative means distance from transducer to keel)
*h.h = Checksum
ID21: NMEA $GPSSS
String format:
$GPSSS,ddd.dd,eeee,c.cc,t.t,m.m,,f<CR><LF>
ddd.dd(m) = distance in meters from the transducer face to the target.
eeee(m/s) = sound velocity
c.cc(m) = offset
t.t(ms) = pulse length
m.m(s) = Output rate (Time in seconds between pings)
*f = checksum
<CR><LF> = end of sentence carriage return and line feed characters.
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