Appendix-19
NOTE 5 The navigational status indicator is according to IEC 61108 requirements on ‘Navigational (or Failure)
warnings and status indications’. This field should not be a NULL field and the character should take one of the
following values:
S = Safe when the estimated positioning accuracy (95 % confidence) is within the selected accuracy
level corresponding to the actual navigation mode, and integrity is available and within the
requirements for the actual navigation mode, and a new valid position has been calculated
within 1 s for a conventional craft and 0,5 s for a high speed craft
C = Caution when integrity is not available
U = Unsafe when the estimated positioning accuracy (95 % confidence) is less than the selected
accuracy level corresponding to the actual navigation mode, and/or integrity is available but
exceeds the requirements for the actual navigation mode, and/or a new valid position has not
been calculated within 1 s for a conventional craft and 0,5 s for a high speed craft
V = Navigational status not valid, equipment is not providing navigational status indication.
・MSS – MSK receiver signal status
$--MSS,x.x,x.x,x.x,x.x,x*hh<CR><LF>
1
2 3 4 5
1：Signal strength (SS), dB/1 mV/m
2：Signal-to-noise ratio (SNR), dB
3：Beacon frequency, 283,5 kHz to 325,0 kHz
4：Beacon bit rate (25, 50, 100, 200) bits/s
5：Channel number (see Note)
NOTE Set equal to "1" or null for single channel receivers.
・ALR – Set alarm state
$--ALR,hhmmss.ss,xxx,A, A,c--c*hh<CR><LF>
1
2 3 4 5
1：Time of alarm condition change, UTC
2：Unique alarm number (identifier) at alarm source
3：Alarm condition (A = threshold exceeded, V = not exceeded)
4：Alarm’s acknowledge state, A = acknowledged / V = unacknowledged
5：Alarm’s description text
・APB – Heading/track controller (autopilot) sentence B
$--APB, A, A, x.x, a, N, A, A, x.x, a, c--c, x.x, a, x.x, a, a*hh<CR><LF>
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15
1：Status: A = Data valid V = LORAN-C blink or SNR warning (see Note 2)
V = general warning flag for other navigation systems when a reliable fix is not available
2：Status: A = OK or not used V = LORAN-C cycle lock warning flag (see Note 2)
3：Magnitude of XTE (cross-track-error)
4：Direction to steer, L/R
5：XTE units, nautical miles
6：Status: A = arrival circle entered V = arrival circle not passed
7：Status: A = perpendicular passed at waypoint
V = perpendicular not entered
8：Bearing origin to destination, M/T
9：Bearing origin to destination, M/T
10：Destination waypoint ID
11：Bearing, present position to destination, magnetic or true
12：Bearing, present position to destination, magnetic or true
13：Heading to steer to destination waypoint, magnetic or true
14：Heading to steer to destination waypoint, magnetic or true
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