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Board » Technical Support » Coordinate discrepancies

Posted by
tequilla2


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1
Registered at
2011-11-14 18:15:49
2012-01-08 23:00:01 - Coordinate discrepancies
Hello,

When moving my mouse over the starting line of leg 3 ( I am assuming it will be the same as the finish line of leg 2) I see that the coordinates are 24N47 - 54E28. However, according to the official leg 3 notice of race, the start will be at 24N28.1220 054E16.9440. These official coordinates, according to my mouse position, are on the mainland approximately 13.34 nm @ 210.74 from the starting line.

When checking my cursor position in Sailplanner,it shows the race start position accurately

When using the Sailplanner near the end of leg 2, I noticed this discrepancy and stopped using it thinking that it had a bug.

I have now deduced that my mouse location in SOL is inaccurate. How do I fix that? I am using Firefox latest version on Windows vista. I have tried deleting my browser cache.

Thank you

Raymond on tequilla2
Posted by
76Trombones


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362
Registered at
2009-08-03 18:04:56
2012-01-09 00:50:55 - Re: Coordinate discrepancies
Hi tequilla2 - this is a common mismatch when comparing between different maps. The SOL client uses decimal degrees (24.469N) while brainaid's NOR is using degree-minutes (24N28.122). The giveaway is the position of the "N" as well as any spaces, and sometimes ' and " ...

60 minutes per degree, so 24N 28.122' translates as 24N + 28.122/60=.469

Confusing yes, and probably responsible for several hundred annual IRL runnings-aground, but there you go... SOL is very realistic! :)

76
Posted by
NZL_PaulR


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2008-07-22 12:21:30
2012-01-09 01:13:35 - Re: Coordinate discrepancies
I think 76T has UNDERSTATED the number of groundings by a factor > 100!! LOL!!
If it breaks, it's not strong enough!
Posted by
AGage


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2008-12-27 10:31:57
2012-01-09 06:03:07 - Re: Coordinate discrepancies
I'm not quite sure how differences in coordinate systems can be responsible for running aground, especially as SOL does not use coordinates for any inputs, but you may be interested to know that in an upcoming client release there will be the option to display coordinates as either decimal degrees or degrees decimal minutes. The DDM format will also include direction, so instead of -1.50 it will display '1°30.0S' (or W if a longitude)
I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__

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