I'm attaching a weather routing done with the Shannon38-opencpn.CSV and related XML file. The crossing starting June 1 from Brenton Light to Lizard, Eng in 15 days seems a little short, but the same route calculated with no Polar file, but with the Boat characteristics (38'loa, 34'lwl, 22000 lb displacement, etc) is longer, about 25 days.
Brenton Light, RI ---> LIzard, England June 1, 2014 3057nm 14.5 days
Using Climatology wind and currents with date set to June 1
The route approximates the Jim Cornell route and dips down further to catch the Gulf Stream.
When currents are turned off, the route does not drop as low and it takes a day longer.
The BrentonLight-Lizard.gps is attached, it shows a pretty fast pace in certain places, perhaps due to favorable current?
Also attached are the Jim Cornell Routes in color with dashed and dotted lines.
The routings do roughly follow Jim Cornell's routes. Also included is a 10 day and 7 day route to Horta and Falmouth using the same Shannon38 Polars
Brenton Light to Horta Azores 10 days + 2 day layover
Horta Azores to Falmouth England 7 days 4 hours
Note that using the builtin VPP for a 38' boat instead of the boat polars, the route to Horta is 15 days.
The weather_routing does not mimic the Jim Cornell dogleg to England.
The polar files do work! They must be formatted correctly and loaded, which sometimes takes some persistence. Try closing the plugin and closing Opencpn and starting over if you are having trouble, it helps to reset things back to normal.
Would like others thoughts on the amount of time calculated for the voyage.
While I think of it, in Weather_routing, I would like to have a Hide/Show eye for the route list, so that the plugin will skip those calcs and not show those last completed routes on the chart when "Run" is hit. ...Saves time.
Thomas, sorry about monologue. nice to see someone else uses. Thread. Don't know if anyone reads it. Sean does sometimes.
Did you try starting out with the standard boat.xml? I will upload it in an hour. Sometimes that helps. It would be very nice to get polar files sorted out and file operations related to edit boat working better. Your help and testing is appreciated.
If you don't hear from sean you might pm.him with a link to your post. Thanks. Better not a monologue.
Sent from my SCH-I545 using Cruisers Sailing Forum mobile app
Trying weatherRouting, with my french language file, I see many items that are not translated.
Here join some screens copy. You can see where are the not translated
List of items :
Add at boat, New, Batch, Export All, Plot, View.
Configuration batch, Start time, Boats, Staring, For, day(s), Spaced, day(s), hour(s), Apart
Auto connect, Within, Connect, Disconnect all, Generate,
Configuration batch, No weather route selected,
Category, Reser All, Done,
Empty route, Nothing to export,
Weather routing settings, Cursor route color, Destination route color, Route thickness, Iso chron thickness, Alternates routes thickness, Squares at sail changed, Filter routes by climatology, Computation,
Number of concurrents threads, Help,
New source, Enter name,
Weather routing statistics, Overall, Run time, Current route, UUpwind, Port/Starboard, Average wind, Average wave, State, Stopped, Iso chrons, Rotes, InvRoutes, skip positions, Positions.
Some of these items are in the actual pot file, many other are not in the actual pot file.
Sometimes the plugin is picky about these files. If it is close the plugin and opencpn and reopen, to reset it. Then try again.
The two sample files are shown below. They are paired. If you load the XML file the referenced polar file will be loaded if it is in the path and the correct format.
Shannon38-opencpn-roundtrip.XML [This is the <boat>.XML file]
... and further down Shannon38-opencpn.CSV [This is the <boat polar>.csv file.]
You cannot use a qtVLM polar file (although that would be nice) because there are subtle differences... please compare the qtVLM Polar and Weather_routing polar for the Shannon38 in this post.
I am going to attach the two Shannon38 files that worked for me, perhaps you can get those working?
These files should have doc removed and be placed in the ProgramData/Opencpn directory. Give them a try please
Just tried another routing using the "Shannon38-opencpn.xml" file and the companion polar file "Shannon38-opencpn.csv"
The owner of the Shannon has advised that the polars need some adjustment (this routing is overly optimistic), but effort is a dry run to make sure things work. Once I had the files, all that was necessary to Configure > Boat > Browse and pick the Shannon38-opencpn.xml file (located in C:/ProgramData/Opencpn/ for windows users). This file will automatically looks for the polar file Shannon38-opencpn.csv also in the same directory. If it is not found, there is an error.
Weather_routing_pi Polar format is NOT the same as your boats qtVLM polar and must be converted. Please see the post above for how the formats differ. Hopefully the Windows program "Polauto" by Patrick Tiersp will be able to convert from qtVLM to Weather_routing_pi, please give it a try (that is still in beta testing).
Once the routing is done, first with a 12 hour interval to test, then with 6 hours (using Climatology only with Wind and Current on) also Detect Land and only Climatology Grib was checked, the routing can be saved to the Route Manager. This new track will appear as an unmaned track under the track tab in Route Manager RM. Using Track Properties edit the title and and export as a GPX file if you wish.
Discussion about the differences between qtVLM and Weather_Routing_pi POLARS is found here Weather Routing
The Windows Polar program which may be able to convert various polar files is here. Test Polauto by using OpenCpn w/o instruments The conversion piece is relatively new, and I noticed some differences last time I used it. This is still in beta for conversions, but give it a try. There is more information about various Polars in this thread.
The Shannon38-opencpn.csv polar has not had some big reductions in accord with the owner's experience, and is now called Shannon38-opencpn-Ted.csv with the companion Boat.xml file being called Shannon38-opencpn-Ted.XML.
Running the routing from Brenton Reef, Newport RI to Falmouth Eng using Climatology wind and currents enabled, starting June 1 using these files, it appears 3 days are added. Weather_routing_pi shows 18 days 10hrs. - Of course I don't believe this is how long it will take, and I am expecting more like 30 days, so I still think this is optimistic.
Here are the values used in the polar which appear to me to be pretty reasonable.
if it is "optimistic" then it is either the polar is optimistic (and you can fix that), or not taking into account factors like swell (which should eventually be integrated) because it slows the boat beating and speeds up (surfing) running. Any ideas for how to deal with swell in some sense that is actually useful?