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 » Technical Support » Problem with course selection in new client.

Posted by
captjack1942


Users avatar

Posts
239
Registered at
2008-01-18 03:24:03
2008-12-10 19:05:59 - Problem with course selection in new client.
Last night at apx. 3:30 to 4:00 AM PST (11:30 --> 12:00 UTC) I had set alarm to wake to make course change at Lizard Pt. to finish. I spent about 30 minutes triple checking course adjustments to make sure that I had set a CC to hit the finish line just north of the south mark.
As I had to get up early and leave this morning, I was not able to check on finish till apx. 10:30 AM PST. When I did I found that my boat had passed to the south of the bottom mark and my boat was wrecked on shore.
Is the CC setting using the helm tool setting the course on Great Circle course or direct CC? If so please explain.
There are many times when we must by necessity be away from our computers and must trust that when a course is set it will be accurate. It just cannot be a moving target. When we set a precise course especally over such a relitively short distance (apx 40 Nm) we expect it to happen. :(
Posted by
NZL_PaulR


Users avatar

Posts
311
Registered at
2008-07-22 12:21:30
2008-12-10 20:43:48 - Re: Problem with course selection in new client.
Possible Solutions:

Set a course with a "little in the bank" = aim higher just in case, just like IRL sailing. If you aim at the mark, you'll need to tack to get around it.

Allow for a little leeway.

These ancient rules must be followed.

Just shows again how SOL is very similar to the real life situation!


--- Last Edited by Paul Rosser at 2008-12-10 20:44:28 ---
If it breaks, it's not strong enough!
Posted by
kalle


Users avatar

Posts
413
Registered at
2007-06-01 09:58:04
2008-12-10 20:46:21 - Re: Problem with course selection in new client.
I'll look at the code and come back with a straight answer.
Posted by
Hellsteeth


Users avatar

Posts
3
Registered at
2008-05-19 15:03:58
2008-12-11 18:29:13 - Re: Problem with course selection in new client.
Although I prefer the new flash tool over the old client, I have to say exactly the same happened to me as mentioned by captjack1942 as well last night. I zoomed in all the way over the finish line and saw my own '6 hour ahead line' crossing easily the southern tip of the finish line - with some head room. However, I also crossed the line and kept going until I hit land the other side. I woke up and sailed back over the line a second time before it was registered.
Maybe - the finish line could change colour like the rhumb line when you are on course to hit it?
Posted by
kalle


Users avatar

Posts
413
Registered at
2007-06-01 09:58:04
2008-12-11 18:52:20 - Re: Problem with course selection in new client.
Me and Jakob looked at the code. The "pick course" tool is not using great circle, but the value is rounded to two decimals (as shown in the box). That was unintended and a mistake - I will rewrite that code as soon as I've got some spare time.
Posted by
captjack1942


Users avatar

Posts
239
Registered at
2008-01-18 03:24:03
2008-12-13 22:34:12 - Re: Problem with course selection in new client.
Thanks Kalle, Yeah a tenth of a degree is way more than enough. IRL you're lucky to get within 5 degrees of a course line. :-)

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Tall Ships Races 2025 - Le Havre to Dunkirk


Welcome to the first of four virtual Tall Ships Races in European waters which are concurrently being organized in-real-life by Sail Training International . The course for this first race is between the French ports of Le Havre and Dunkirk; circa 125nm in Sailonline’s magnificent 90m Barque.
NOTE: Starts and Finishes in tall ships racing are always offshore to avoid conflict with shipping and shipping lanes; online and real-life may not match exactly.
Race #1923
INFO by brainaid.de
Barque 90m PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TS - SYC
Race starts: Jul 07th 16:00 Registration Open!
▶ Flash
GO TO RACE

Red Eye - Key Lime Pie-gatta 2025

Opposite the Bahamas at the tip of the Florida peninsula, we find the Florida Keys, a honky-tonk arpeggio of islands, where another SOL classic, the Key Lime Pie-gatta, so-called after the famous local condensed-milk-based tart speciality, awaits to be navigated once again. We’ll race its “Red Eye” 180nm in very-American Santa Cruz 52s, ignoring such artefacts as bridges, causeways and piers joining the keys one to the other and to the mainland!
Race #1846
INFOby brainaid.de
Santa Cruz 52 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: SYC - RED
Race starts: Jul 02nd 12:00 Registration Open!
▶ Flash
GO TO RACE

Sail Around Turkey 2025


Welcome to the 11th running of one of Sailonline's most iconic races, where our fleet races the length of the Turkish coastline from Hopa (the easternmost harbour on Turkey’s Black Sea coast) to Iskenderun (the easternmost harbour on Turkey’s Mediterranean coast). It’s a 1,372nm race and aboard our classic, 1st decade of the 21st Century, version 2 IMOCA 60, you should be able to get around the course in less than a week. That is if, of course, once you get out of the Black Sea you don’t stop to enjoy the sights or a BBQ or two in the Golden Horn, or on the Marble Islands, now land-locked Troy or Gallipoli or any of the myriad Aegean islands, that you shall have to carefully navigate past.
Race #1930
INFOfrom brainaid.de
IMOCA 60 v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Jun 27th 15:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member CriticalHippo
  2. Sailonline Yacht Club Member KaSToR
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member FreyjaUSA
  5. Sailonline Yacht Club Member rafa
  6. Sailonline Yacht Club Member Kipper1258
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member Patrick70119
  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