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Board » Technical Support » channel island race

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Posted by
goblin


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2008-12-25 10:23:02
2010-01-21 06:36:40 - channel island race
in channel island race I returned back from indian rocak as some others did.. but it seems like programm does not except my NE crossing! any idea why?
regards
Posted by
Schakel


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2008-12-19 09:19:00
2010-01-21 07:15:41 - Re: channel island race
If a marker says Pass NE you have to at least hit a certain latitude to the north and a certain lontitude to the east of it. Apparently, you didn't touch upon the lontitude. Do not turn back until the marker says "Rounded" to indicate you have indeed rounded it.

HTH, HAND,
Philip

Posted by
goblin


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2010-01-21 07:59:43 - Re: channel island race
how does the marker syas you rounded? where do you see that notification?
Posted by
goblin


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2010-01-21 08:01:57 - Re: channel island race
when you look at the map I definetly did cross to NE part of the mark.. I have difficulties to understand
Posted by
Schakel


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2010-01-21 08:06:13 - Re: channel island race
The marker in the web client will show when the marker is rounded.

See attached jpeg.

HTH, HAND,
Philip
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Posted by
goblin


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2010-01-21 08:34:46 - Re: channel island race
I did not know that Philip, thank you for the info. when I look at the figures my turning point is 118.524 E which is almost 0.5 m east of the mark.. do you know why system does not read it as it is crossed?
rgds
aydin
Posted by
Schakel


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2010-01-21 10:51:14 - Re: channel island race
I don't really know if this is how it really works and I am not sure if can explain it properly, but in my mind I approach it like this: in this case, the mark is a 90° angle from a compass course of rougly 270° going to 180°. I think the trigger for passing the mark is an imaginary line at roughly 45°, so the further to the north you are, the further east you have to go to trigger it.

Like I said, I don't know if that is true, but that's the way I think of it. In the image I posted earlier I was on dc, so I made sure I had some margin.

Good luck,
Philip

Posted by
goblin


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2010-01-21 11:15:30 - Re: channel island race
may be guys behind the scene can chechk and explain to me:) ı fell I cross to NE direction..
regards
Posted by
goblin


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2010-01-21 17:02:17 - Re: channel island race
Jakob??? any answer?
regards
aydin
Posted by
Incognito


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2008-12-06 13:43:52
2010-01-21 18:16:05 - Re: channel island race
Schakel is basically right.

Let's work with an example. You are about to pass the waypoint above in the attached picture.

The angle between that waypoint and the previous one (below left) is 240°. The angle between that waypoint and the next one (below right) is 170°.

To pass the current waypoint, you have to cross the imaginary line (shown in red) that bisects these two angles.

In our example, we could calculate the bisector as follows:

Total angle between the two routes:
(360°-240°)+(170°-0°) = 290°

Bisector:
240° + 290°/2 - 360° = 240° + 145° - 360° = 25° or
170° - 290°/2 = 170° - 145° = 25°

Regards,

Francois
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