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 - Masirah to Chagos


Having crossed, re-crossed and re-re-crossed the Convergence Zones of the Pacific and the Atlantic, we now face our second crossing of the Convergence Zone of the World’s third great equator-spanning sea, the Indian Ocean, taking us from the channel between Masirah Island and the Oman mainland to the Chagos Archipelago. It’s 1900nm and we’ll be sailing our very fine Archer 78, and won’t mention that both locations (of departure and arrival) are heavily militarized and the why’s and what next’s concerning that – mindful as always of SOL Netiquette.
Race #1988
INFOby brainaid.de
Archer 78PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Oct 02nd 18:00 Registration Open!
▶ Flash
GO TO RACE

Carib Rum Run 2026


Ahoy, ye landlubbers and seasoned salts! Welcome back to Sailonline’s legendary Carib Rum Run, perfectly timed to kick off on International Talk Like a Pirate Day, 19 September!

This year, we command the magnificent Falkun—the ultimate high-tech superyacht modeled after the iconic Maltese Falcon. This 1759nm slalom takes us through the Caribbean’s rum islands to plunder barrels from local distilleries and deliver them to the rum-parched sands of Cancun.

Join SYC before the finish to disguise yer boat with a pirate name for this race only. Hoist the sails, sharpen yer cutlasses, and plot your winning course!
Race #2060
INFO by brainaid.de
Falkun PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 19th 05:00 Registration Closed
▶ Flash
GO TO RACE

Shearwater - Rio de la Plata to Irish Sea 2026

Welcome to the fourth leg of our MIG series. This time we're racing the Sooty Shearwater on their migration from the breeding grounds in South America to the northern Atlantic. This is also part of our Ocean Championship, and as such the third race of OCQ3 2026. This race will be sailed in our Gunboat 90. Race #2055
INFO by brainaid.de
GunBoat 90 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ3 - OCCH - SYC - MIG
RACE CLOSE: Thursday,
October 1 at 2300 UTC.
Race starts: Sep 02nd 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member Panpyc
  6. Sailonline Yacht Club Member cdhinman
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member rthinman
  9. Sailonline Yacht Club Member BRENTGRAY
  10. Sailonline Yacht Club Member Sax747

View full list

Series

Mobile Client

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

The mobile client