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 » distance to go

Page: 1 2 Next

Posted by
TUR3169


Users avatar

Posts
7
Registered at
2008-12-26 12:54:21
2009-02-17 07:38:56 - distance to go
Yesterday at 13:00 UTC my distance to go was 11.860 miles. Today at 07:30 I have 12.252 miles although I kept sailing the same direction. How can this be possible?
Posted by
Schakel


Users avatar

Posts
183
Registered at
2008-12-19 09:19:00
2009-02-17 08:15:15 - Re: distance to go
A similar question has been replied to by Jakob here: http://www.sailonline.org/board/thread/1664/?page=1#post-1664

Also, at http://team-yacht-treff.de/pub/ranking-125.html you'll find a ranking for leg 5, courtesy of Brainaid. He may be using a different method of calculation.

HTH, HAND,
Philip

Posted by
TUR3169


Users avatar

Posts
7
Registered at
2008-12-26 12:54:21
2009-02-17 08:56:31 - Re: distance to go
I am afraid this doesn't reply my question. Distance to the leader can vary due to the several reasons. My questions is to the increasing distance to finish line, although I am sailing in the same direction.
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-02-17 10:10:09 - Re: distance to go
Do not worry, dtg will make more sense as we approach the Horn :-)
...one of the guys behind the game...
Posted by
TUR3169


Users avatar

Posts
7
Registered at
2008-12-26 12:54:21
2009-02-17 10:15:14 - Re: distance to go
I am sure it's true:) But, I still belive there is a serious calculation mistake done by the system which leads some part of the fleet to go to the wrong direction.
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-02-17 10:40:14 - Re: distance to go
1) I do not think there is any mistake done in the dtg-calcs. Maybe you would choose another algorithm but I developed a scheme that works pretty good in most cases. It is very difficult to come up with a algorithm that in all cases coincide with everyones intuitive sense of what is right. First I cal the dist to rounding, then dist from that to finish. When we are soooo darn far from rounding and the pole is involved, the point of rounding is moving around. Take a globe and play around with it and you will see what I mean. The calcs are ok, but the concept of dtg is ambigous at the moment. Be cool and things will start to make sense as we come closer to cape.

2) If people are mislead by the dtg-calcs when 12000nm from goal through doldrums, etc I cannot be blamed. A look at Google-earth or a globe often does wonders for the understanding.
...one of the guys behind the game...
Posted by
TUR3169


Users avatar

Posts
7
Registered at
2008-12-26 12:54:21
2009-02-17 11:01:25 - Re: distance to go
Thanks for the reply. My understandings :
1- in 24 hours being located 380 miles behind a day before position is normal. No matter you sail continuously the same direction to the finish line.
2- Better to use other tools rather than the information to be provided by the system.
Posted by
Zembu


Users avatar

Posts
41
Registered at
2008-12-15 20:58:27
2009-02-17 12:22:19 - Re: distance to go
Adnan, when you say sailing in same direction do you mean you are sailing the great circle route as shown by the ruler, and you are sticking to that course?

If so then the dtg should become shorter, but if you are sailing slightly off the great circle your dtg could get longer. I'm no expert though. :-)
Posted by
TUR3169


Users avatar

Posts
7
Registered at
2008-12-26 12:54:21
2009-02-17 13:16:54 - Re: distance to go
That's my point. I am sailing to nearly the same direction. Visually I am forwarding down on my course, but dtg is still 370 miles longer than my yesterday's distance.
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-02-17 16:09:45 - Re: distance to go
Trust me, dtg will make more sense as we approach the Horn.
...one of the guys behind the game...

Page: 1 2 Next

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

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 vida
  6. Sailonline Yacht Club Member bonknhoot
  7. Sailonline Yacht Club Member Sax747
  8. Sailonline Yacht Club Member rumskib
  9. Sailonline Yacht Club Member CollegeFund
  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