Si-tex SP38, Installation And Operation Manual, Page: 171 / 193

Sitex SP38 Installation and Operation Appendices
Document PN 29010101 V1r0
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Sentence Description Data Used
*APA Autopilot Sentence “A”
Cross-Track Error, Arrival Status, Bearing from
Origin to Destination, Waypoint ID
*APB Autopilot Sentence “B”
Cross-Track Error, Bearing from Origin to
Destination, Waypoint ID, Course to Steer
*BOD Bearing – Origin to Destination
Bearing from Origin to Destination, Waypoint
ID
*BWC
Bearing and Distance to
Waypoint
Range to Destination
*GLL
Geographic Position
(Latitude and Longitude)
Latitude, Longitude
*HDG
Heading, Deviation and
Variation
Magnetic Heading, Magnetic Variation
*HDM Heading, Magnetic Magnetic Heading
*HDT Heading, True True Heading
*HSC Heading Steering Command Course to Steer
*MWV Speed and Angle Angle, Speed
*RMA
Recommended Minimum
Specific Loran-C Data
Speed
*RMB
Recommended Minimum
Navigation Information
Cross-Track Error, Waypoint ID, Range to
Destination, Bearing from Origin to Destination,
Arrival Status
*RMC
Recommended Minimum
Specific GNSS Data
Speed, Magnetic Variation
*VBW Dual Ground / Water Speed Speed
*VHW Water Speed and Heading Speed
*VTG Course Over Ground and Speed Speed
*VWR Apparent Speed and Angle Angle, Speed
*VWT True Speed and Angle Angle, Speed
*XTE Cross-Track Error Cross-Track Error
Table 8 – NMEA 0183 Sentences Accepted by the SP38
All sentences received must have valid checksums. Sentences which do not have any checksums, or
have invalid checksums, will be ignored. In some cases, if the missing/invalid condition persists long
enough, an INVALID CRS DATA, SPEED DATA, and/or HEADING error will occur.
A number of the various data values used by the autopilot can be received in one or more different
sentences (for example, Speed can be received in VTG, VHW, VBW, RMA or RMC). If a particular data
value is received in more than one sentence, then the value in the highest-priority sentence – per
Table
8 – will be the one used by the autopilot.