IS12 and TP32

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   I am sure there are a few of you out there with the combination IS12 and TP32. I recently replaced my IS15 with IS20 and became aware that the tiller pilot is allowed to feed compass data into the system, which is something it did already with the IS12. 

I now wonder if anyone has reacted to this, and in what way? It seems strange to me that the tiller pilot is used as a compass when its position in reference to the boat is depending on whether it's engaged or not.

Johan 

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Johan Hackman Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral of the Fleet Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361	Post Options Post Reply Quote Johan Hackman Report Post Thanks(0) Quote Reply Topic: IS12 and TP32 Posted: 16 January 2008 at 19:38
	I am sure there are a few of you out there with the combination IS12 and TP32. I recently replaced my IS15 with IS20 and became aware that the tiller pilot is allowed to feed compass data into the system, which is something it did already with the IS12. I now wonder if anyone has reacted to this, and in what way? It seems strange to me that the tiller pilot is used as a compass when its position in reference to the boat is depending on whether it's engaged or not. Johan
	http://www.johanhackman.se

Johan Hackman Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral of the Fleet Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361	Post Options Post Reply Quote Johan Hackman Report Post Thanks(0) Quote Reply Posted: 10 February 2008 at 21:09
	I think the silence of this thread speaks for itself. The standard IS12 setup doesn't seem to give you the information I am talking about, so no one could probably have detected a problem. However, I am changing my initial question to a little contest. The numbers in the photo below don't add up correctly. I will send the first one who can tell how they don't add up a bottle of red wine, regardless of where in the world they live. If you don't drink red wine I'll change the prize to whatever is your poison. Johan
	http://www.johanhackman.se

Alain & Anne Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 13 December 2005 Location: France Status: Offline Points: 562	Post Options Post Reply Quote Alain & Anne Report Post Thanks(0) Quote Reply Posted: 10 February 2008 at 22:05
	Hi Johan, I think that you should have 330° instead of 269° because you get the wind from port side.
	UHAMBO 430e#004 White hull-teck deck-Yanmar 55hp-long range cruising OCC Our blog: www.uhambo.fr

Scorpio Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 15 August 2006 Status: Offline Points: 295	Post Options Post Reply Quote Scorpio Report Post Thanks(0) Quote Reply Posted: 10 February 2008 at 23:05
	Boat Heading is about 115, Wind is about 155 off the port bow, therefore True Wind direction is about 320 (360-(155-115)). Instruments say True Wind is 269 - a difference of 51 degrees Poses a few questions... 1. Has the steering compass been swung, if so what's the deviation (not 51 degrees I hope!) 2. Has the fluxgate compass in the TillerPilot been swung and what's the deviation 3. Is the TillerPilot installed in it's correct position or is just lying on the cockpit seat, turned about 50 degrees from its mounted position? Ed Edited by Scorpio - 10 February 2008 at 23:06
	Ed Essery Scorpio GBR 9824T Hanse 342#465 - Solent Based

Junker Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 February 2007 Status: Offline Points: 167	Post Options Post Reply Quote Junker Report Post Thanks(0) Quote Reply Posted: 11 February 2008 at 07:17
	Johan, What is displayed on the IS 20? I assume the compass data is coming from a tilller pilot. I think this is mounted on the "wrong" side. I.e starbord, and the pilot still thinks that it is mounted on the port side. I guess this is a setting/ calibration issue. regds Rune

Johan Hackman Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral of the Fleet Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361	Post Options Post Reply Quote Johan Hackman Report Post Thanks(0) Quote Reply Posted: 11 February 2008 at 08:42
	Wow! I didn't expect you guys to be so quick. Both the Uhambo crew and Ed are correct, the Wind Direction should be somewhere between 320 and 330 degrees. Alain and Anne were first so they won! Congratulations! Ed asks three interesting questions and the third one is the one I am trying to get at. However, I don't think there is a "correct" position for the autopilot. It's either engaged and hooked on to the tiller, or it's disengaged and lying on the cockpit seat. In this case it's lying on the cockpit seat and that's why the 269 degrees are so erratic. IS20 is also capable of showing Heading based on the compass data fed into the system. If the TP32 is the source the information will be just as wrong. It's not showing the boat's Heading, but the Heading of the autopilot whatever the position of the autopilot is. And you can't turn that off! I just wanted to see if anyone else could spot a thing like this and I thank you all for your input! Johan
	http://www.johanhackman.se

colincooper Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 23 October 2005 Location: United Kingdom Status: Offline Points: 562	Post Options Post Reply Quote colincooper Report Post Thanks(0) Quote Reply Posted: 11 February 2008 at 08:43
	Johan, As you say it makes little sense using the compass in the tillerpilot. My guess is you have disconnected it and swung lain it on the bench to get the above wrong readings. However, using the compass in a fixed autopilot setup (we use the AP25) makes perfect sense. The sensors probably don't know the difference. Is there a NMEA message saying "this compass direction is on a moveable compass"? Probably not. I guess you can delve in and tell the setup to ignore your compass - or ignore the reading yourself.
	Colin (owner of Hilde - a 370)

colincooper Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 23 October 2005 Location: United Kingdom Status: Offline Points: 562	Post Options Post Reply Quote colincooper Report Post Thanks(0) Quote Reply Posted: 11 February 2008 at 08:45
	Hey you posted the picture just as I wrote that..... confirmed.
	Colin (owner of Hilde - a 370)

Junker Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 19 February 2007 Status: Offline Points: 167	Post Options Post Reply Quote Junker Report Post Thanks(0) Quote Reply Posted: 11 February 2008 at 14:25
	Hi It should be possible to use data from the GPS instead of the compass from the TP Just an suggestion regd Rune

sulutime Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 06 April 2006 Status: Offline Points: 96	Post Options Post Reply Quote sulutime Report Post Thanks(0) Quote Reply Posted: 12 February 2008 at 13:54
	Sorry Johan if I'm being stupid but what about pulling the plug of the tiller pilot when disconnected? This should take the pilot built-in compass signal out of the IS20 system and assure reliable readings. You can even go exoteric and find out which pin in the plug carries the heading signal and remove it altogheter. Wind system will work with its heading and the tiller pilot will still have its internal heading signal to steer. I don't think they ever work togheter, instead there must be somewhere in the software a priority program to choose wich signal is master when two or more are present. Fabrizio



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