Appendix-23
・WPL – Waypoint location
$--WPL, llll.ll, a, yyyyy.yy, a, c--c*hh<CR><LF>
1 2 3 4 5
1：Waypoint latitude, N/S
2：Waypoint latitude, N/S
3：Waypoint longitude, E/W
4：Waypoint longitude, E/W
5：Waypoint identifier
・ACK – Acknowledge alarm
$--ACK,xxx*hh<CR><LF>
1
1：Unique alarm number (identifier) at alarm source
・HDT – Heading true
$--HDT, x.x, T*hh<CR><LF>
1 2
1：Heading, degrees true
2：Heading, degrees true
・THS – True heading and status
$--THS,x.x,a*hh<CR><LF>
1 2
1：Heading, degrees true
2：Mode indicator (see Note)
NOTE Mode indicator. This field should not be null.
A = Autonomous
S = Simulator mode
V = Data not valid (including standby)
・DBT – Depth below transducer
$--DBT, x.x, f, x.x, M, x.x, F*hh<CR><LF>
1 2 3
4 5 6
1：Water depth, feet
2：Water depth, feet
3：Water depth, m
4：Water depth, m
5：Water depth, fathoms
6：Water depth, fathoms
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