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:

Cross the Convergence 2026 - Robinson Crusoe to Galapagos


Welcome to our first race of a new series of ocean voyages across the World’s convergence zones, this first race taking you north from south of the Tropic of Capricorn to the Equator-straddling Galapagos, home of magical iguanas and other exotic fauna (but no mythical kings, Dory) Departing from the island where in 1704 adventurer Alexander Selkirk inspired Daniel Defoe to write the best-seller "The Life and Adventures of Robinson Crusoe", by debarking off the unsound "HMS Cinque Ports", four months before she foundered off the coast of present-day Colombia, we will sail the 2200nm in our decidedly sounder and faster than the " Cinque Ports",
Ocean 50 !
Race #1983
INFOby brainaid.de
Ocean 50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Jan 16th 18:00 Registration Open!
▶ Flash
GO TO RACE

Bight of Bonny TIMED Race 2026

Welcome to the first TIMED race of 2026! Our race finds us in the Gulf of Guinea and the Bight of Bonny. Starting in Douala, Cameroon the 170 nm course takes us around the island of Bioko with its Caldera and tropical rainforests finishing in Calabar, Nigeria. The boat for this race is the sporty Farr 30. This is a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have 13 days and 11 hours to test your skill and decision making after the race opens.
Race #2004
INFOby brainaid.de
Farr 38 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ1 - TRCH - SYC
RACE CLOSE: Saturday,
24 January at 23:00 UTC
Race starts: Jan 11th 12:00 Registration Open!
▶ Flash
GO TO RACE

Natuna Sea Race 2026


At 4.0N 108.2E lies the island of Natuna Besar, Great Natuna, surrounded by at least 154 islands, of which 127 uninhabited, Indonesia’s Natuna Regency, and all around this archipelago, the Natuna Sea, bordered by Borneo to the east, the Java Sea to the south, and the Malay peninsula to the west, and extending north to cross a disputed international border with China into the South China Sea. And it’s a border that matters, there’s gas here! But why worry, let’s race – 2050nm in our goo’ol’ Open 60s in between the production platforms, prowling destroyers and submarines.
Race #1997
INFOby brainaid.de
Open 60 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Jan 06th 17:00 Registration Closed
▶ Flash
GO TO RACE

Cape Town to Rio 2026

Welcome to South Africa and RCYC's classic transatlantic Cape2Rio Race from Cape Town, South Africa, to Rio de Janeiro, Brazil. First run in 1971, this run is buddied with the IRL, Cape2Rio 2025 arranged by the Royal Cape Yacht Club with the cooperation of the
Iate Clube do Rio de Janeiro Despite this being announced the 2025 race (starting dec. 27) it is the 2026 SOL championship kickoff. This virtual version, will be raced once again in Mark Mills' 74ft speedster, the stunning C2R74.
Race #1996 INFO
by brainaid.de
C2R74 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ1 - OCCH - SUPBUD - SYC
Race starts: Dec 27th 12:00 Registration Closed

▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member bonknhoot
  6. Sailonline Yacht Club Member Sax747
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member vida
  9. Sailonline Yacht Club Member Panpyc
  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