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 » General Discussion » Navigation problrm

Posted by
etxnebe


Users avatar

Posts
6
Registered at
2007-12-23 10:29:47
2008-06-01 19:16:32 - Navigation problrm
If I set a course on the goal line I expext to end up in the goal not 15 nm to the north. I had activated Great circle navigation and saw tyhat the course line was curved but when I
checked why my boat was stranded I saw
that it had sailed in a stait line not as shown on the map when a doid set the course (last rare to Boston previouse race same problem on Hawai).

Can anybody telll me the purpose with great circle navigation idf the boat do not follow the coures set.

Looking forward to some good piece of advise in this matter.

Regards

ETXNEBE
Attachments
Posted by
clash


Users avatar

Posts
4
Registered at
2007-11-20 20:10:24
2008-06-02 14:38:23 - Re: Navigation problrm
Hi etxnebe!
Great circle course is not a "straight" line as CC are!
Following a GC course forces you to change CC now and then.
Try to use the ruler and click along the May Transat rhumbline every 250Nm for example. You will find that you have different CC in most of the "boxes" created by each click!
Any help to You?
clash2
Posted by
Tomas


Users avatar

Posts
19
Registered at
2007-08-10 09:15:02
2008-06-02 14:45:59 - Re: Navigation problrm
Hi!
Great circle nav is just so you can see the "bent" closest route over earth a flat earth and with the course tool pick the initial course.
Lust like in real life you have to alter course manually to follow the great circle.

Compass course is just a angle from magnetic north.

Posted by
Jeroen


Users avatar

Posts
245
Registered at
2007-08-15 09:17:47
2008-06-03 12:02:45 - Re: Navigation problrm
Yeah both remarks are correct.

Great circle nav will give you a indication how your track would be like if you optimize it to take in account the earths bend.

I can understand your confusion becouse it gives a bit the impression this will be the actual course. As said this will require constant adjustments allong the path.

Hope this helps to clear up, sorry to hear you mist the finnish by this.



--- Last Edited by Jeroen Tiel at 2008-06-03 12:03:15 ---
I am a ex-admin of SOL who joins in from time to time.
Posted by
etxnebe


Users avatar

Posts
6
Registered at
2007-12-23 10:29:47
2008-06-03 18:50:05 - Re: Navigation problrm
Hello!

Thanks for all the good explanations to my problem. Shall I conclude this matter by saying that if I set a strait cource to the finish line(no Great circel nav. on) the system will get me there but not on the shortest way. If I use Great circle navigation I will get the shortest way but I have to update the compass cource in regular intervalls to hit the target.

Very best regards

Etxnebe

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Roma per Tutti 2026


Sailonline are honoured and delighted to have been asked to partner an online first Roma per Tutti yacht race with organizing yacht club, Circolo Nautico Riva di Traiano . In real life, this will be the 33rd edition of this 540nm offshore race from Rome’s Riva di Traiano to the Aeolian Islands and back. Online, the race will not only be our first partnership with CN Riva di Traiano, but also the second race of our Magical Mediterranean series. A number of Mini 6.50s have been entered for the 33rd edition of the Roma per Tutti; so our own vintage Mini is also our virtual yacht of choice for this one.
Race #2019
INFOby brainaid.de
Mini 6.50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: MED - SUPBUD - SYC
Race starts: Apr 11th 10:00 Registration Open!
▶ Flash
GO TO RACE

Rommel by Balloon 2026 - Through the Sahara


Generalfeldmarschall Johannes Erwin Eugen Rommel may have been that chivalrous, gallant tank commander of legend, led astray by the Prussian military traditions of loyalty and chain of command, but one thing he wasn’t, was mad. So, let’s do it anyway – not stick to the coast and the battle for logistical superiority – but depart the oases of Siwa south west into the desert for Agadez and its uranium. And let’s go by balloon, it’s only 2500km (1250nm)!
Race #1973
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: BOL - SYC
Race starts: Apr 07th 13:00 Registration Open!
▶ Flash
GO TO RACE

Falklands to Tasmania 2026

Welcome to yet another all-new route. This next race is part of our Ocean Championship as well as the ROW series. Falklands to Tasmania, is like last year's island to island. It’s one of the longer ones 6400nm, more than half way around the world (and the Antarctica). It starts the 2026 OCQ2, and will be sailed in our Steinlager 2, contrary to prior notice.
Race #2021
INFO by brainaid.de
Steinlager 2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ2 - ROW - OCCH - SYC
Race starts: Apr 06th 11:00 Registration Open!
▶ 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 rafa
  4. Sailonline Yacht Club Member rumskib
  5. Sailonline Yacht Club Member CriticalHippo
  6. Sailonline Yacht Club Member CollegeFund
  7. Sailonline Yacht Club Member Panpyc
  8. Sailonline Yacht Club Member Sax747
  9. Sailonline Yacht Club Member sassy63
  10. Sailonline Yacht Club Member vida

View full list

Series

Mobile Client

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

The mobile client