Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

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

Posted by
Sambal


Users avatar

Posts
33
Registered at
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


Users avatar

Posts
33
Registered at
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 ---
Attachments
Posted by
Sambal


Users avatar

Posts
33
Registered at
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.
Attachments
Posted by
76Trombones


Users avatar

Posts
362
Registered at
2009-08-03 18:04:56
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 ---

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Red Eye - Myth of Malham 2025

In 1947, Hugh McLean & Sons of Gourock, Scotland built a radical racing yacht for John Illingworth, soon-to-be Commodore of the RORC, to a design by Laurent Giles. With a masthead rig, giving her ‘free’ sail area per the rules of the time, and short overhangs reducing pitching, Myth of Malham went on to win The Fastnet that year and again in 1949, and to compete in numerous Admiral's Cups. In 1958, in honour of the yacht, the Myth of Malham race was conceived - a mini-Fastnet to the first lighthouse on a rock west of Cowes, Eddystone, rather than the second, to be held in non-Fastnet years. IRL this year it has been raced already, but this stops us not from “Red Eye” racing its online 230nm in Fareast 31Rs, leaving how to deal with the Isle of Wight open to your own discretion.
Race #1847
INFOby brainaid.de
Fareast 31R PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - RED
Race starts: Aug 25th 12:00 Registration Open!
▶ Flash
GO TO RACE

Africa by Sea 2025 - Maputo to Mogadishu


The fifth leg of our exploration of Africa By Sea takes us north along the length of the Continent’s succulent sub-tropical and tropical Indian Ocean coast. Much fought over by traders and colonists both well-before and after a Portuguese expedition under the command of Vasco da Gama first sailed there from Europe back in the 16th century, it is yet to be properly explored as a yachting destination. With plenty of islands off- and inshore, small and very large, there is much to interrupt your 1900nm voyage and visit in your Swan 65, from Maputo to Mogadishu! Race #1858
INFOby brainaid.de
Swan 65 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - ABS
Race starts: Aug 20th 17:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member vida
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member KaSToR
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member Sax747
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member FreyjaUSA
  10. Sailonline Yacht Club Member CollegeFund

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client