If you want something more simplistic, you can try this:
Windward - Keep the mark between your bow and shrouds.
Leeward - Keep the mark between your bow and half the distance to the
shrouds.
It's far from perfect, but it is simple enough to keep you close, while
you are trying to figure out all the VMG
stuff.
Cheers,
Jeff Nelson
Muir Caileag
C&C 30 - 0549
Armdale Yacht Club
On 2021-10-06 1:25 p.m., Bob Mann via CnC-List wrote:
I don't understand how either answer is telling me it's time to gybe.
Bob
On 10/06/2021 11:37 AM Shawn Wright via CnC-List
<cnc-list@cnc-list.com> wrote:
I don't race, but do use VMG when trying to get our best time to
destination, especially on longer days. This works well enough in
many long channels and inlets with wind aligned with our course, but
sometimes it's not aligned. In these instances I'll have to try this
trick for fooling the VMG by giving it a waypoint at the far end of
whatever channel we're navigating. Of course, I'll have to read the
B&G manual, as their UI is not that intuitive, or things don't always
work as you expect.
--
Shawn Wright
shawngwri...@gmail.com
S/V Callisto, 1974 C&C 35
https://www.facebook.com/SVCallisto
On Wed, Oct 6, 2021 at 8:30 AM Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:
Bob,
First, let's define some terms.
VMG (wind based) - the component of your velocity DIRECTLY upwind
or downwind.
WCV - waypoint closure velocity. The component of your velocity
headed directly at your mark (assuming it's set in your GPS).
This is often shown on most GPS systems as VMG.
Now, if you don't have an instrument system that calculates VMG,
don't use GPS VMG (WCV). The problem is that, as you approach
the layline, WCV will tend to zero. If you overstand and cross
the layline, WCV will become negative. While this is good
information for when to tack or gybe, it's usually too late.
Here's how to fake your GPS into giving you VMG (wind based).
Set a waypoint well past the windward mark. Let's assume the
race committee sets a good W/L course with the windward mark
directly upwind of the start. Let's say the wind is from 000 and
the windward mark is set at 000 for a 2 mile leg. Enter a
waypoint in your GPS at 000 20 miles out. By setting the
waypoint so far out, WCV will approximate VMG.
--
Dennis C.
Touche' 35-1 #83
Mandeville, LA
On Wed, Oct 6, 2021 at 10:03 AM Bob Mann via CnC-List <
cnc-list@cnc-list.com> wrote:
I'm fairly new to flying a spinnaker. I did it last weekend
in a race and I believe I overstood the mark as we were
sailing 110 AW before the gybe and 85 AW heading directly to
the mark.
How does one determine when to gybe?
Bob
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- use PayPal to send contribution -- https://www.paypal.me/stumurray
Thanks - Stu
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costs involved. If you want to show your support to the list - use PayPal to
send contribution --https://www.paypal.me/stumurray Thanks - Stu
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