Weather Routing

[rgleason]

Using your gfs grib file which you renamed... I also loaded climatology and enabled it because Provincetown to Cape Lookout routing require more grib data than you had in the file, so the different colors show where average climatology data is uses and where the gfs grib data is used.


Have you tried just running your config with just Climatology on and not using the grib file?


Have you tried the sample routings at the beginning which use Climatology only? Do they run successfully?


I don't know where "Boat" destination is located. Is it outside the grib area?

[clamshack]

I cleaned up some mistakes I was making and it seems to work now.

1. Selected Location on the Chart and then Added it as Origin/Destination
2. Selected Polar from within the Boat XML

Looking through the manual these seem like common mistakes

[rgleason]

Good job. Now keep in mind that rouring around land masses like islands and complicated land is tricky and sometimes fails. You have to adjust settings.

[ALROCHARARI]

Hello Guys,

Need your help again on a strange weather routing beheavior.

This is happening on a lot of different simulations with different weather models.
On the attached picture you can see an isochrons "line" which is not corresponding to anything and that I can not understand.
Routing never goes over it and you can observe very strange route suggestions including the yellow one on the cursor.

Can somebody help me?

https://www.dropbox.com/s/js0vrle381..._Line.jpg?dl=0

Same waypoints, same grib file, same weather routing parameters,
problem happening on Windows 11 OpenCPN 5.6.2 with WeatherRouting 1.13.49.0, not happening on RPI OpenCPN 5.6.2 with WeatherRouting 1.13.49.0.

Thanks in advance,
Raoul

[rgleason]

The yellow route is the alternative route to your cursor.


"you can see an isochrons "line" which is not corresponding to anything and that I can not understand."


Please draw a red arrow to the line you are talking about and upload again.

Originally Posted by ALROCHARARI

Hello Guys,

Need your help again on a strange weather routing beheavior.

This is happening on a lot of different simulations with different weather models.
On the attached picture you can see an isochrons "line" which is not corresponding to anything and that I can not understand.
Routing never goes over it and you can observe very strange route suggestions including the yellow one on the cursor.

Can somebody help me?

https://www.dropbox.com/s/js0vrle381..._Line.jpg?dl=0

Same waypoints, same grib file, same weather routing parameters,
problem happening on Windows 11 OpenCPN 5.6.2 with WeatherRouting 1.13.49.0, not happening on RPI OpenCPN 5.6.2 with WeatherRouting 1.13.49.0.

Thanks in advance,
Raoul

[ALROCHARARI]

Originally Posted by rgleason

The yellow route is the alternative route to your cursor.


"you can see an isochrons "line" which is not corresponding to anything and that I can not understand."


Please draw a red arrow to the line you are talking about and upload again.

Yellow line coming from harbor "La Rochelle" going to the "line" and then coming back to the cursor position which is clearly not the best route to go to the cursor position.

I have surrounded this "line" in red in following picture.

https://www.dropbox.com/s/8oq3ctfl5u...e%202.jpg?dl=0

During routing calculation, best route is over this line without crossing it and close to the destination, the route goes under this line but never cross it.

Not happening at all on RPI.

[rgleason]

I thought it was that line. Would you like to attache the grib file? Where did you get it?
If you download a new grib file, does this occur?

[wholybee]

Originally Posted by ALROCHARARI

Hello Guys,

Need your help again on a strange weather routing beheavior.

This is happening on a lot of different simulations with different weather models.
On the attached picture you can see an isochrons "line" which is not corresponding to anything and that I can not understand.
Routing never goes over it and you can observe very strange route suggestions including the yellow one on the cursor.

Can somebody help me?

https://www.dropbox.com/s/js0vrle381..._Line.jpg?dl=0

Same waypoints, same grib file, same weather routing parameters,
problem happening on Windows 11 OpenCPN 5.6.2 with WeatherRouting 1.13.49.0, not happening on RPI OpenCPN 5.6.2 with WeatherRouting 1.13.49.0.

Thanks in advance,
Raoul

While you think every setting is the same, if the results are different then they almost certainly are not.

Can you post your boat.xml file(the one named for your boat), your WeatherRoutingConfiguration.xml file, your polar file, and the grib file, each from both the windows PC and the pi. I am sure you will find something is different between them. There are settings which if incorrect will cause odd routing like that.

[ALROCHARARI]

Please find a new test with more recent data.
The famoust "line" is still there.
I tried to attach all relevant files.

https://www.dropbox.com/s/lm4t9x6lww...20Bug.zip?dl=0

Other modified parameters are:
- Maximum search angle in advanced page set at 180
- Avoid cyclones trajectories activated in advanced page
- In options of advanced page: zone avoidance activated

Can you reproduce it?

[rgleason]

I havent tried to reproduce it, but the grib file works fine and the routing looks good.

[ALROCHARARI]

Originally Posted by rgleason

I havent tried to reproduce it, but the grib file works fine and the routing looks good.

I have the feeling that a solution to my problem is not for tomorrow...

If this abnormal beheavior is due to some wrong parameters, we need to identify them (I doubt this is the explanation)

If this is not the explanation then it's a bug that need to investigated more deeply. I'm available to support the necessary debugging.

Sean, if you read me...

[ALROCHARARI]

Look at this video to see the build process and maybe better understand the issue:
https://www.dropbox.com/s/3n996i61vk...24-49.mkv?dl=0
You see the line appearing after 28 seconds +/- at cursor position

Look at this picture to see that the line sometimes change direction and that you can have more than 1 line:
https://www.dropbox.com/s/o8bbzogrrw...lines.jpg?dl=0

Can not be linked to grib data as I have the same issue on multiple grib files
Can not be linked to polar data from boat as I have the same issue if I change the boat
Can not be linked to parameters as I change them every run since 2 days without any change



Help! Experts Gurus Captains Help!

[ALROCHARARI]

Originally Posted by wholybee

While you think every setting is the same, if the results are different then they almost certainly are not.

Can you post your boat.xml file(the one named for your boat), your WeatherRoutingConfiguration.xml file, your polar file, and the grib file, each from both the windows PC and the pi. I am sure you will find something is different between them. There are settings which if incorrect will cause odd routing like that.

Have the feeling you might be right.
Still trying to identify a gap but without success so far.
Still searching...

[wholybee]

I spent just a few minutes looking at it. Bad memories of why I stopped using this plugin and now pay for predictwind. It can be very difficult to diagnose why a route fails, and they will fail very often if everything isn't exactly right.

Anyway, you posted files from your windows machine, but not the rpi. I'd like to see those. Using the files you posted, the compute failed with the cryptic and not very useful "polar failed" error. I then switched to use my boat.xml file for my boat, and my polars. Then i got a "Polar:Land:Failed" error. Next, I moved your waypoints away from shore, and I got a successful route, that made sense.

So first , I suspect there is an issue with your polar file. Are they *exactly* the same boat.xml files and .pol files on both the Windows and rpi computers?

Second, the start and end waypoints are too close to shore. They need to be at least as far from shore as the step size. So, if the step size is 1 hour, and your boat is sailing at 5 knots, then you need to be 5nm away from land. In some cases you might need to be even further, if because of the wind you will be sailing toward land before you turn away. You can reduce the step size to sail closer to land, but then the calculation will take much longer.

The grib itself, the wind is primarily coming from the south-west, the direction you are trying to sail, and a quick glance at your .pol upwind pointing ability is poor. This will cause the route to sail away from the destination and tack about to get there, and maybe eventually fail.

I need to head off to work, but can look again tomorrow morning if you post all of the files from the rpi.

[rgleason]

wholybee wrote:

Using the files you posted, the compute failed with the cryptic and not very useful "polar failed" error. I then switched to use my boat.xml file for my boat, and my polars. Then i got a "Polar:Land:Failed" error. Next, I moved your waypoints away from shore, and I got a successful route, that made sense.

This is absolutely right. I cannot say how many times I've advised about this problem!

I suggest you try testing with a different polar file, or different settings. You will eventually find out what change allows it to complete properly. I am sorry but I am focused on other problems right now, not related to boating.

As they say, garbage in --> garbage out.