New Posts New Posts RSS Feed: GPS detection of OCS?
  FAQ FAQ  Forum Search   Register Register  Login Login

GPS detection of OCS?

 Post Reply Post Reply Page  123>
Author
alstorer View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 02 Aug 07
Location: Cambridge
Online Status: Offline
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
-_
Al
Back to Top
yellowwelly View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 24 May 13
Online Status: Offline
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?
Back to Top
Brass View Drop Down
Really should get out more
Really should get out more


Joined: 24 Mar 08
Location: Australia
Online Status: Offline
Posts: 834
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.

Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 7706
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.
Firefly 2324, Lightning 130, Puffin 229, Leader, Topper 44496, yellow Minisail
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 5474
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
Back to Top
Lukepiewalker View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 24 May 06
Location: United Kingdom
Online Status: Offline
Posts: 1331
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...
Ex-Finn GBR533 "Pie Hard"
Ex-National 12 3253 "Seawitch"
Ex-National 12 2961 "Curved Air"
Ex-Mirror 59096 "Voodoo Chile"
Back to Top
alstorer View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 02 Aug 07
Location: Cambridge
Online Status: Offline
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
-_
Al
Back to Top
craiggo View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 01 Apr 04
Location: United Kingdom
Online Status: Offline
Posts: 1733
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.
Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 7706
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.
Firefly 2324, Lightning 130, Puffin 229, Leader, Topper 44496, yellow Minisail
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 5474
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.
Back to Top
 Post Reply Post Reply Page  123>

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz