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Catalina/Capri 25/250 Sailor's Forums

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GPS

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osmepneo
Past Commodore

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USA
1420 Posts

Initially Posted - 10/30/2002 : 09:51:05

I recently bought a Garmin GPS (legend) and have been thinking about how this might aid in racing. I'm wondering how others use GPS when they are racing?

Thanks

Don Peet
c25, 1665, osmepneo, sr/wk

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 10/30/2002 : 12:03:40

I used my GPS to find the sweet spot for sail trim. Tweak and watch the speed change. If you a novice it will give you sunset time at destination. Just teasing.

Doug&Ruth
Triska (Alberg 29)
Tacoma Wa.

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 10/30/2002 : 13:14:32

Don,

That's right up my alley....

I handle almost all the electronics on Tsunami (Evelyn 32) and do all navigational tactics. Depending on your model...I use the Garmin 12 and the version of the Magellan Meridian...you can have at any given time
<ul>
ETA to the next mark
Depth (mapping models)
your bearing which will give Confirmation of the lift or header you think your in (i.e. when to tack and stay to stay in phase)
speed over ground
VMG (especially helpful downwind)
I use the mapping model to help determine a layline....
plus numerous other things....
</ul>

To start, find someone on your race crew who is electronically ept. Use the GPS to check boat speed. As you make corrections, use the speed information comparitively. Check your speed before, during and after tacks. Make crew adjustments accordingly.

After that move on to additional things....

Just Remember....The GPS just helps you sort the DATA....its not going to make the decisions on the race course.

dw

Duane Wolff
"The Flying Wasp"
C-25, #401 std,sk
Chief Measurer C-25/250 National Assn.
<img src="http://im1.shutterfly.com/procserv/47b2d603b3127cce9f858f0ef3ef0000001010" border=0>

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John G-
Admiral

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793 Posts

Response Posted - 10/30/2002 : 13:38:10

Don - If your local club has permanent marks in the harbor or racing area put them all into the GPS then all things are possible. You can find the favored end of the starting line, see if you are headed or lifted, along with judging boatspeed and your sail trim. Also the difference between the speedo and the VMG to the mark will keep you out of unfavorable currents. Let your trimmers use the speedo for sail trim and let the navigator use the GPS for VMG. Down wind is always a tossup between boatspeed and angle to the mark the GPS will add greatly to that judgment call.
Good luck.
 

[url="http://www.peregrinefund.org/"]<img src="http://www.peregrinefund.org/images/intro_mid_image.GIF" border=0>[/url]
 John G- "PEREGRINE" C25-#4762 FK

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 10/30/2002 : 21:19:50

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
Let your trimmers use the speedo for sail trim and let the navigator use the GPS for VMG. Down wind is always a tossup between boatspeed and angle to the mark the GPS will add greatly to that judgment call.
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
John said it all right there. That belongs in the textbook.

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette-Honda "Passage" in SW CT

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