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Board » Sailonline Yacht Club » Big difference SOL map and Sailplanner

Posted by
Sambal


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2008-06-05 22:57:47
2011-11-16 19:30:42 - Big difference SOL map and Sailplanner
On SOL-map the SW point of Noronha is at -3.8778 and -32.4795.
If I make a waypoint in Sailplanner with this position it will be placed 1 NM north of Noronha!
Why?
There is also a difference with for example TWA when I sail the same CC at the same position and the same time! That makes Sailplanner difficult to use...
Posted by
Sambal


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2008-06-05 22:57:47
2011-12-19 00:28:32 - Re: Big difference SOL map and Sailplanner
Hmm..
Some comments in this thread must have bin deleted? Why?

I´m still confused about Sailplanner. I made same route with High and Super high resolution. High (and all other resolution) suggested CC 60. Super high suggested CC 344 with TWA 32! That could not be serious. Is it a bug? Can I trust in Sailplanner?

--- Last Edited by Sambal at 2011-12-19 00:30:19 ---
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Posted by
Sambal


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2008-06-05 22:57:47
2011-12-19 00:31:02 - Re: Big difference SOL map and Sailplanner
Here is same route with High resolution.
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Posted by
76Trombones


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2011-12-19 11:09:29 - Re: Big difference SOL map and Sailplanner
Most routing programs show TWA<best-upwind-angle when the calculated route includes a tack (or other direction change)over the timestep. This doesn't necessarily mean that you should be tacking continuously over the straight line bit, it can be telling you that neither tack is favoured, or that there is a band of stronger wind that you can stay inside (within reason).

You always need to interpret results. The "too shallow" twa are actually giving you more information about the routing and weather than if each step of the routing was actually sailable as shown.

You're normally not far off if you tack back and forth across the routed path maintain best VMG.

76T

(edit: I think there's another thread with the same title over in technical support... so no posts deleted!)
-

--- Last Edited by 76Trombones at 2011-12-19 11:12:22 ---

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