ZL electronics Technology AL900 User Manual download pdf (Page 4)

5. Sentence Identifiers and Formats

AAM Waypoint Arrival Alarm

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$--AAM,A,A,x.x,N,c--c*hh

1) Status, BOOLEAN, A = Arrival circle entered

2) Status, BOOLEAN, A = perpendicular passed at waypoint

3) Arrival circle radius

4) Units of radius, nautical miles

5) Waypoint ID

6) Checksum

ALM GPS Almanac Data

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$--ALM,x.x,x.x,xx,x.x,hh,hhhh,hh,hhhh,hhhh,hhhhhh,hhhhhh,hhhhhh,hhhhhh,hhh,hhh,*hh

1) Total number of messages

2) Message Number

3) Satellite PRN number (01 to 32)

4) GPS Week Number: Date and time in GPS is computed as number of weeks

from 6 January 1980 plus number of seconds into the week.

5) SV health, bits 17-24 of each almanac page

6) Eccentricity

7) Almanac Reference Time

8) Inclination Angle

9) Rate of Right Ascension

10) Root of semi-major axis

11) Argument of perigee

12) Longitude of ascension node

13) Mean anomaly

14) F0 Clock Parameter

15) F1 Clock Parameter

16) Checksum

APA Autopilot Sentence "A"

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$--APA,A,A,x.xx,L,N,A,A,xxx,M,c---c*hh

1) Status

V = LORAN-C Blink or SNR warning

A = general warning flag or other navigation systems when a reliable

fix is not available

2) Status

V = Loran-C Cycle Lock warning flag

A = OK or not used

3) Cross Track Error Magnitude

4) Direction to steer, L or R

5) Cross Track Units (Nautic miles or kilometres)

6) Status

A = Arrival Circle Entered

7) Status

A = Perpendicular passed at waypoint

8) Bearing origin to destination

9) M = Magnetic, T = True

10) Destination Waypoint ID

11) checksum

The

NMEA

0183 Protocol

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ZL electronics Technology AL900 User Manual Page 4

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