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Autopilot NMEA question for gear heads
I just bought a Raymarine ST1000 Plus tiller autopilot for my Endeavour 32.
The astute among your will immediately wonder how this will work on a 13,000 pound 32 foot wheel driven boat. The unit will just drive the vane servo shaft on the Cape Horn steering gear now on order. We could have bought even a smaller tiller pilot if one was available. Since I was trying to buy the smallest and cheapest unit I could get, I was surprised to find out how sophisticated it is. Given the right NMEA input, it evidently will follow a track to a waypoint instead of just blindly maintaining a given course. It will even rollover to a new waypoint and run another leg. The Raymarine manual describes the inputs needed to follow a track but in plain English. The Garmin manual for the GPSmap 76Cx I will be using says: The following are the sentences for NMEA 0183, Version 3.01 output: Approved sentences- GPGCA GPGLL GPGSA GPGSV GPRMB GPRMC GPRTE GPVTG GPWPL GPBOD GPAPB If anyone could annotate a quoted copy of this list I would appreciate it. I've tried to find a listing via Google but the only one I can turn up is quickly replaced by another page before I can read it. Presumably, the Capt'n wants you to buy the information. A link to a similar but readable listing would also help. Any tips or experience interfacing and using one of these autopilots with a GPS also appreciated. -- Roger Long |
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