If that's the case, I'm in excellent company. :) Rich
> On Jan 13, 2014, at 18:17, "dwight" <dwight...@gmail.com> wrote: > > Rich > Agree on that, I am not yet aware of your weak points…sounds like women might > be a problem…but please remember I have very little data to base that on > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rich > Knowles > Sent: January 13, 2014 5:48 PM > To: cnc-list Cnc-List > Subject: Re: Stus-List Autohelm St4000 how it should work with the GPS > > Well, we're not all good at everything! > > Rich > > > > > > > > On Jan 13, 2014, at 5:37 PM, dwight <dwight...@gmail.com> wrote: > > Now you know why I asked such basic questions that some of you thought heavy > on Curtis… > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rich > Knowles > Sent: January 13, 2014 5:27 PM > To: cnc-list Cnc-List > Subject: Re: Stus-List Autohelm St4000 how it should work with the GPS > > Curtis: > > The fluxgate compass is the primary source of heading information for the > autopilot head and should not be disconnected. > > When you push the "AUTO" button, the course computer locks on to the compass > heading the boat is on and develops internal correcting signals as the boat > yaws to either side of the original heading and uses those cross-track error > signals to drive the wheel and hold the course steady. Once properly set up, > the course holding abilities of the ST4000 are quite good and you should be > on a constant course in the direction originally set. This way of using the > ST4000 is the standard way of operating. It's just fine for relatively short > legs but, as it only uses the boat's heading as a reference, it cannot > compensate for current or leeway of the boat. In other words, you could be > doing 220 deg for several hours and be miles of your intended destination if > a cross current caused by tide has pushed you away from the rhumb line. > > To avoid getting pushed off course by factors that the fluxgate compass > cannot measure or compensate for, an external source of cross-track error > signals is needed that uses the final destination point as the reference from > which to calculate whether course correction is needed. > > When you have a "GO TO" destination set up and activated on the GPS unit, the > GPS will develop off course signals that can be used by the auto helm > computer to steer the boat to the destination. That information is delivered > to the ST4000 via the NMEA signals. > > Pardon me if you are aware of this already. I strongly recommend reading the > manuals and, if there are terms that are unclear, Google them up. > > Hook that compass up and RTFM! > > Rich Knowles > INDIGO LF38 > Halifax, NS. > > > > > > > On Jan 13, 2014, at 4:26 PM, Curtis <cpt.b...@gmail.com> wrote: > > I have a flux gate compass I disconnected it from the head because I thought > the auto-pilot head would now get its heading from the GPS unit? > > So I will take some photos and show you what I have. > > How will I ever nap a nap in??? > > > On Mon, Jan 13, 2014 at 2:19 PM, Michael Brown <m...@tkg.ca> wrote: > > > >Though something to consider is that the 0183 standard is for a total of 4 > >wires to send and recieve. RX+GND and TX+GND. I didn't see where you > >mentioned all those wires...sounded like too few. > > The ST4000 control head is NMEA IN only, two wires marks - +. > > > > > > So now, If I understand you correctly. I first have to create a route then > > to > > start navigating a course or to a way-point. That should start > > broadcasting a course to steer signal. then I in-gauge the st4000 by > > pressing the +10 and -10 at the same time and it should start taking > > direction from the Garmin? > > does this sound correct? > > > > > With NEMA to the ST4000 it depends on what is being sent. Autohelm describes > two > scenarios, automatic acquisition and manual acquisition. > > Automatic - both cross track error and bearing to waypoint are sent > Manual - only cross track error is sent > > With automatic get everything engaged and press +10 and -10 together. The > manual > requires that you get on course withing 5 degrees of the bearing to the > waypoint and > cross track less than 0.1 nm, then press +10 and -10 together. > > My guess is, and strictly a guess, is that the ST4000 uses its own fluxgate > compass > for navigation and takes some error correction from NEMA for cross track. > > > > > > >I know it has probably been done by others but I am not sure that I would > >ever let my ST 4000 plus steer a course unattended based on transfer data > >from my chart plotter. > > > I wonder if that was what Autohelm was thinking, they seem to use the > fluxgate compass. > > > > Curt ? it?s been my experience that pretty much NO equipment uses the same > > color wire for the same thing, even among equipment from the same > > manufacturer. > >You need to connect the NMEA0183 output wires from the GPS to the NMEA0183 > >input wires on the > autopilot; TX+ and TX- on the Garmin to RX+ and RX- on > >the Raymarine. > >I can guarantee that the chances of any two of these wires having common > >colors is about zero. > > > Supposedly the + is Red and - is Blue, however Autohelm agrees with you. They > are marked + and - only. > > > Michael Brown > Windburn > C&C 30-1 > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > > > > -- > At sea, I learned how little a person needs, not how much. > - Robin Lee Graham > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2247 / Virus Database: 3658/6498 - Release Date: 01/13/14 > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2247 / Virus Database: 3658/6498 - Release Date: 01/13/14 > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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