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GPS detection of OCS?
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alstorer View Drop Down
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Posts: 2899 		Post Options Post Options   Quote alstorer Quote  Post ReplyReply Direct Link To This Post Topic: GPS detection of OCS?
    Posted: 07 Dec 13 at 8:27am
from the sailing watch thread
Originally posted by JimC

How about voice activation for the buttons... 
The GPS signal would give you clock synch anyway, but wireless LAN race signal sync with a "server" on the committee boat sounds perfect... 

And once you've got that and the GPS you also have everything you need for race tracking. Add to that differential GPS and a unit on each end of the line and there could also be automatic OCS notification which could mean no more black flags... Just think how easy race management would be if you didn't have to spot OCS or do general recalls:-)

How do you propose squaring the definition of OCS (and finishing, as the same could give you finish times) with a wrist mounted unit?

Or change it, so that OCS is the mast and require a mas mounted unit? Requiring a bow mounted unit would cause all sorts of definition and mounting problems with boat design, especially on anything with a bowsprit that launches through a snout


Edited by alstorer - 07 Dec 13 at 8:27am
-_
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Posts: 2003 		Post Options Post Options   Quote yellowwelly Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 13 at 8:34am
Is GPS accurate enough?
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Posts: 1151 		Post Options Post Options   Quote Brass Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 13 at 9:16am
You may be aware ISAF Racing Rules Committee is running a Subcommittee investigating GPS/sensors for OCS.

I understand that the positioning problem is addressed by measuring-in the sensor unit, then calculating an offset to the end of the bow, and possibly some sort of offset to allow for B-max.

Problem with dinghies would be that that approach wouldn't cover hiking positions of crew, especially trapeze.

Definition of start could be changed (by ISAF, not SI, cos SI cannot change Definitions), but you would need to be careful that you didn't come up with a definition that suited GPS/computers but did not suit mark one eyeball.
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 13 at 9:48am
I'm guessing that the Mk1 eyeball can, on most club startlines, tell to just a few inches whether a bow is over the line. I can't see GPS managing that at all.
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Posts: 6661 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 13 at 9:58am
I was very much thinking on my feet... Agree about disqdvqntages of position etc, but I was mostly thinking about the communications aspect. Remember it doesn't have to be perfect, merely no worse than the current system. A mast base mounted transponder and offset probably works for one designs.
I imagine RRS changes would be needed, quite likely one that gave alternative definition of start for controlled races.



Edited by JimC - 07 Dec 13 at 12:04pm
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Posts: 1341 		Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 13 at 11:57am
It's a dream wishlist, we're not proposing anything...
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Posts: 2899 		Post Options Post Options   Quote alstorer Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 13 at 10:07pm
Originally posted by JimC

I was very much thinking on my feet... Agree about disqdvqntages of position etc, but I was mostly thinking about the communications aspect. Remember it doesn't have to be perfect, merely no worse than the current system. A mast base mounted transponder and offset probably works for one designs.
I imagine RRS changes would be needed, quite likely one that gave alternative definition of start for controlled races.

I appreciate it was an off-the-cuff suggestion. But it's one that merits some investigation.

Could have some sort of hybrid system combining transponders on the committee boat and pin-end mark with GPS
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craiggo View Drop Down
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Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 13 at 10:13pm
Not sure if GPS is accurate to that level.
Could use a high speed camera and a Matlab script to check the image and determine who was over the line.
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 08 Dec 13 at 10:59pm
I prefer the idea of a high powered rifle set about 6" above the water. Any boats with holes in the bow were over. Any helms with extra holes in the bum were a long way over.
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Posts: 6661 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 13 at 5:00am
Originally posted by craiggo

Not sure if GPS is accurate to that level.
standard GPS certainly isn't. But if you used DGPS maybe with a reference station on each end of the line, then that's supposed to be capable of close to 10cm resolution which is surely good enough.
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