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#1
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posted to rec.boats.electronics
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I would like to control my Raymarine ST1000 Plus Autopilot, somehow
from a GPS without use of the internal compass. This would eliminate the problems of the boat motions affecting the compass. Is this possible? Or can the boat motion / compass problem, in heavy sea, on a small boat, be solved in an other way? By wind vane control? Thanks Urs |
#2
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posted to rec.boats.electronics
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On 23 Feb 2007 08:13:31 -0800, "muelec" wrote:
I would like to control my Raymarine ST1000 Plus Autopilot, somehow from a GPS without use of the internal compass. This would eliminate the problems of the boat motions affecting the compass. Is this possible? Or can the boat motion / compass problem, in heavy sea, on a small boat, be solved in an other way? By wind vane control? Thanks Urs From my observations, an autopilot guided by GPS still uses its (or a) compass as a heading reference. When first engaging "steer by GPS", the autopilot will turn the boat to the "bearing to waypoint" indicated by the GPS - and it can only do that by comparing the compass heading to the GPS-provided bearing. Once on-course, the autopilot turns its attention to the cross-track error information provided by the GPS, and adjusts its "desired heading" to minimize XTE - but it is still using its compass as a heading reference. You could add a SeaTalk compass to the system - the autopilot would use that compass instead of its internal compass. I don't know if the external compass would improve the pilot's performance to any extent... -- Peter Bennett, VE7CEI Vancouver BC, Canada peterbb4 (at) interchange.ubc.ca new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
#3
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posted to rec.boats.electronics
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![]() Well, In my practical experience, when using the gps track mode (gps interface ) with my autopilot St/4000 for several years, is that the boat has much better tracking, with less yawing, staying much better over the route and spending much less time correcting, working less and consuming less amperes. I have tested a new boat with a S1G (Giro) and the XTE is les than 10 m all the time even with large waves ... Test it yourself ... It is better with a aparent wing angle betwen 45-60 off the bow but works up to 160 degrees very well, take ease to not activate the interface unless you see that the boat ill turn in the desired direction .... and avoid jibes ..... Good luck Pascal |
#4
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posted to rec.boats.electronics
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On 24 Feb., 00:46, "Pascal" wrote:
Well, In my practical experience, when using the gps track mode (gps interface ) with my autopilot St/4000 for several years, is that the boat has much better tracking, with less yawing, staying much better over the route and spending much less time correcting, working less and consuming less amperes. I have tested a new boat with a S1G (Giro) and the XTE is les than 10 m all the time even with large waves ... Test it yourself ... It is better with a aparent wing angle betwen 45-60 off the bow but works up to 160 degrees very well, take ease to not activate the interface unless you see that the boat ill turn in the desired direction .... and avoid jibes ..... Good luck Pascal Giro sounds good (hopefully cheaper than my boat), but S1G and XTE, I don't know. I would be glad for some help with Brand Names, Types and so. Thanks Urs |
#5
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posted to rec.boats.electronics
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On Feb 25, 5:18 pm, "muelec" wrote:
On 24 Feb., 00:46, "Pascal" wrote: In my practical experience, when using the gps track mode (gps interface ) with my autopilot St/4000 for several years, is that the boat has much better tracking, with less yawing, staying much better over the route and spending much less time correcting, working less and consuming less amperes. I have tested a new boat with a S1G (Giro) and the XTE is les than 10 m all the time even with large waves ... Test it yourself ... It is better with a aparent wing angle betwen 45-60 off the bow but works up to 160 degrees very well, take ease to not activate the interface unless you see that the boat ill turn in the desired direction .... and avoid jibes ..... Good luck Pascal don't know. I would be glad for some help with Brand Names, Types Urs: Hi! Does your ST1000 accept NMEA, only SeaTalk, or both SeaTalk and NMEA? SeaTalk has simpler wiring and the ST of ST1000 stands for SeaTalk. You might need to check the documentation with your ST1000 to see if it can accept NMEA sentences. If your ST1000 can read NMEA sentences, then you can use any brand of GPS. If you ST1000 can only read SeaTalk, you might need to consider a Raymarine GPS or a NMEA-SeaTalk interface. I use an ST1000 (driving the trim tab to my rudder) or a ST4000 (driving my tiller) on a boat with displacement too heavy for the ST1000 to drive the tiller. I have wired my ST1000 into the boat's SeaTalk network, meaning that the ST1000 can be used as a stand-alone (if the boat's electronics have failed completely) or the ST1000 can steer using the GPS and waypoint data from the ST4000 head (and the masthead wind instrument, the water speed transducer, waypoints in the electronic charter, etc). Using the full resources of the boat's navigational electronics, my ST1000 does almost as good a job as the ST4000 (and the difference is more likely due to the difference between driving the rudder directly and driving only the rudder trim tab. Hope this helps Bil |
#6
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posted to rec.boats.electronics
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On 25 Feb., 10:45, "Bil" wrote:
On Feb 25, 5:18 pm, "muelec" wrote: On 24 Feb., 00:46, "Pascal" wrote: In my practical experience, when using the gps track mode (gps interface ) with my autopilot St/4000 for several years, is that the boat has much better tracking, with less yawing, staying much better over the route and spending much less time correcting, working less and consuming less amperes. I have tested a new boat with a S1G (Giro) and the XTE is les than 10 m all the time even with large waves ... Test it yourself ... It is better with a aparent wing angle betwen 45-60 off the bow but works up to 160 degrees very well, take ease to not activate the interface unless you see that the boat ill turn in the desired direction .... and avoid jibes ..... Good luck Pascal don't know. I would be glad for some help with Brand Names, Types Urs: Hi! Does your ST1000 accept NMEA, only SeaTalk, or both SeaTalk and NMEA? SeaTalk has simpler wiring and the ST of ST1000 stands for SeaTalk. You might need to check the documentation with your ST1000 to see if it can accept NMEA sentences. If your ST1000 can read NMEA sentences, then you can use any brand of GPS. If you ST1000 can only read SeaTalk, you might need to consider a Raymarine GPS or a NMEA-SeaTalk interface. I use an ST1000 (driving the trim tab to my rudder) or a ST4000 (driving my tiller) on a boat with displacement too heavy for the ST1000 to drive the tiller. I have wired my ST1000 into the boat's SeaTalk network, meaning that the ST1000 can be used as a stand-alone (if the boat's electronics have failed completely) or the ST1000 can steer using the GPS and waypoint data from the ST4000 head (and the masthead wind instrument, the water speed transducer, waypoints in the electronic charter, etc). Using the full resources of the boat's navigational electronics, my ST1000 does almost as good a job as the ST4000 (and the difference is more likely due to the difference between driving the rudder directly and driving only the rudder trim tab. Hope this helps Bil- Zitierten Text ausblenden - - Zitierten Text anzeigen - Thank, this helps me a lot further. My new ST1000Plus accepts NMEA. The question arrises now. What should I buy next, so that the internal compass of the ST1000Plus ist not used anymore, or gives me good steering in waves (on a 5m boat). Giro, Windsensor or even only GPS? |
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