Antarctic Navigation Gates
Post by iconPost by YourMomSA | 2018-01-02 | 01:13:49

Hi Cvetan -

With no ice limit, and boats that can do 40+ kts, I think we're encountering scenarios you haven't had to deal with before.

You have an outstanding ride going. Possibly a winning one, depending on what happens after you reach New Zealand. But I'm guessing you can't run a good routing right now beyond about 10 days... because if you put a waypoint past NZ, it'll route you toward the nearest local Antarctic coast or on a Westerly route. In other words, it's a problem that we have boats that can get half way around an Antarctic circumnavigation with no ice limit under 16 days.

Is there an easy solution? For example, could you place a gate at Cape Horn that the router will simply refuse to pass in the wrong direction?

I have a specific reason for asking... I'm not sure if it's relevant in your case or not. I have a decent run going, but I'm going to fall off the back of the system that you're on the front of. Sometime between January 4 and 7, there's going to be a nice window for new starts. I'm going to have a difficult decision to make about whether or not to re-start at that time. I'd really like to be able to run a routing to Cape Horn on January 3 to make that decision. But I don't think I will have gone far enough by January 3 for that to work yet. I think it will still want to show me the "wrong way" routing.

commenticon 9 Comments
Post by iconPost by Ursus Maritimus | 2018-01-02 | 01:22:49
There is an ice limit, but only where it is on land ...

So it will be like my old basketball trainer used to say: if they don't whistle, it's allowed ;)
Post by iconPost by YourMomSA | 2018-01-02 | 04:03:54
Understood. My point is that with no ice limit, the router can find fast routes to distant destinations in the wrong direction, which wasn't as commonly possible in past editions. So a gate blocking the router from going the wrong direction would be helpful.
Post by iconPost by zezo | 2018-01-02 | 06:51:08
You can do it manually in two passes. Do a 7/8 day routing to appropriate point, the peak in the isochrones is usually pretty obvious. Select the black dot corresponding to the last available starting time, set as start, adjust the time selector and move the destination 5000 miles to the right. Don't forget to reset the time afterwards.
Post by iconPost by Ursus Maritimus | 2018-01-02 | 10:09:28
how do you adjust time, Cvetan?
Post by iconPost by zezo | 2018-01-02 | 11:38:25
I mean the drop-down that says "Start Now" on top.
Post by iconPost by Ursus Maritimus | 2018-01-02 | 13:09:01
ow, only in JVT, yeah clear

Would still be nice if you could set waypoint(s) and destination and the router calculatie to a waypoint and from there to the next with 'start from'. I believe the building blocks are there, but maybe overlook something.
Post by iconPost by zezo | 2018-01-02 | 18:06:16
The problem is the user interface. A lot of stuff has to be added - add/remove/edit waypoints.

And modify the code to combine/display multiple tracks.

Adding "route from here" to the black dots will solve part of the problem, but you can actually route from any place of the old isochrones.
Post by iconPost by Ursus Maritimus | 2018-01-02 | 21:04:51
in the last suggestion, that would require the start NOW or start x3 hours later option that is only in JVT.

I can't help you coding the UI, otherwise I would. Maybe someone else?
Post by iconPost by YourMomSA | 2018-01-02 | 15:01:47
Thanks, Cvetan. This option hadn't occurred to me. Good luck with your run. Mine is falling apart.
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