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:

Great Bear Ice Race 2025


You can fly to Great Bear Lake Airport, but if the ice is good, instead hire a pick-up truck, load your disassembled DN into the cargo bed and drive, first following the McKenzie River north, and then straight across the lake to the start of our final Ice Boat series race of roughly 100nm in length. The Airport authorities have agreed to leave all lights on, so you should just about be able to see where you are going as you zing and rumble, PL-free over the ice!
Race #1853
INFOby brainaid.de
DN PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: DN - SYC
Race starts: Dec 07th 09:00 Registration Open!
▶ Flash
GO TO RACE

Chile Islands RTI Sprint 2025


Across the Canal Puyuhuapi from Puerto Cines on the Chilean mainland lies the Parque Nacional Isla Magdelena, and further west across the Canal Moraleda from Magdelena lie the islands of the Chonos Archipelago. Returning for the first time since 2017 we find ourselves in vari-charted waters here, with the mapping between physical islands and their names not 1:1 but rather some:some. It’s only 26nm but you could get lost! Good luck.
Race 1980
INFO by brainaid.de
First 40 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SPQ4 - SPRCH - SUPSOL – SYC
Race starts: Dec 06th 21:00 Registration Open!
▶ Flash
GO TO RACE

Christmas to Christmas Island 2025

Two waypoints, start and finish, and between them 5827 NM of two oceans. Not much time if we want to sit at the Christmas Eve table. You will need to maintain an average speed of over 10 knots, maybe quite possible with this Maxi Trimaran, but prepare your vessel well and choose the best of the many possible routes. Hands up everyone who knew there were TWO Christmas Islands?! OK, maybe you have sailed this Sailonline course before... but it's time to get ready for the 2025 challenge of racing between Christmas Island in the Pacific to Christmas Island in the Indian Ocean! It also marks the conclusion of our prestigious Ocean Race Championship 2025. Please have fun! Fair winds!
PRIZE: SMPF
Race #1967
INFO by brainaid.de
Maxi Trimaran PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ4 - OCCH - SUPSOL - SYC
Race starts: Dec 01st 11:00 Registration Open!
▶ Flash
GO TO RACE

Sinbad by Balloon 2025 - Carnarvon to Dondra


From here, our home in Bharatavarṣa is now north west of us – said Sinbad to his fellow balloonists. Perhaps we can ride the wind first further north, and then catch the winds that every year bring the rain, perhaps not. It’s 2600nm and we could be aloft awhile, so, Master el-Quarters, victuals only, no sandbags, provisioning the giant hamper. It will be not a picnic!
Race #1886
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SBB
RACE CLOSE: Tuesday,
December 9 at 2300 UTC.
Race starts: Oct 15th 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 CollegeFund
  6. Sailonline Yacht Club Member vida
  7. Sailonline Yacht Club Member bonknhoot
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member sassy63
  10. Sailonline Yacht Club Member Panpyc

View full list

Series

Mobile Client

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

The mobile client