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Old 11-01-2025, 06:46   #1
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OpenCPN chart migration stuck.

Problem opening Opencpn on cellphone

I sent this email to Dave Register at the address given in my Android cellphone Play Store but got no response.

to opencpn@bigdumboat.com


Hello Dave

Since many years ago I have used the free Opencpn version on my laptops with CM93 world chart sets.

Then I bought a Samsung J7 phone and as a backup I installed your version. with a subset of CM93 charts for the caribbean, located on the SD card in the phone.
Worked fine, very happy with it.

Recently I changed the J7 for an Itel A50 A667L with Android 14, and again installed your Opencpn from the appstore. Everything worked fine but the detailed charts did not appear. (I had put the same SD card with the CM93 subset into the new phone). I tried several times to associate the chart files from the "charts" section of the settings, it seemed to precede normally, no error messages, but the detail charts still did not appear.

At some point I got a message to migrate the chart files, so I blindly followed the instructions to do so. I got a display showing the progress of the migration counting down the seconds, but when it got to 2 seconds left it stopped, stuck, with no way get out. (See screenshot)
Closing the app, restarting the phone, and reopening the app results in "Opencpn needs to update the chart directory", I click OK and the same countdown displary runs, again sticking at 1,2, or 3 seconds.


Help!
Cris Robinson


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Old 11-01-2025, 09:25   #2
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Re: OpenCPN chart migration stuck.

Chart migration of CM93 files on Android OpenCPN misses transferring several (3 - 5) files from CM93 folder. These files need to be manually tranferred... usually by connecting to PC.


I'm trying to find the specific files...
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Old 11-01-2025, 09:39   #3
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Re: OpenCPN chart migration stuck.

I tried to find the destination folder of the Chart migration using the phone Android file manager but could not identify it.
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Old 11-01-2025, 09:51   #4
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Re: OpenCPN chart migration stuck.

Android file manager cannot access folder (android\data...) for cuurent Android versions. Hence the need to hook up USB to PC
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Old 11-01-2025, 16:09   #5
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Re: OpenCPN chart migration stuck.

Just installed CM93 on internal memory of Xiaomi 14T Pro phone.
Android 14.

Chart migration and installation worked flawless but needed a bit of patience.
No manual copying necessary.

Chart groups with CM93 and MBtiles work fine too.
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Old 11-01-2025, 16:24   #6
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Re: OpenCPN chart migration stuck.

Quote:
Originally Posted by Franziska View Post
Just installed CM93 on internal memory of Xiaomi 14T Pro phone.
Android 14.

Chart migration and installation worked flawless but needed a bit of patience.
No manual copying necessary.

Chart groups with CM93 and MBtiles work fine too.

That's good. Dave must have fixed that minor error. (I did chart migration with CM93 1-2 OpenCPN versions ago.)
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Old 11-01-2025, 19:45   #7
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Re: OpenCPN chart migration stuck.

Ondine...


Please try to connect your phone to Windows PC, by USB cable.
There you should be able to see the "Charts" directory in the OpenCPN private data location, and copy your desired files directly.


Dave
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Old 12-01-2025, 07:33   #8
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Re: OpenCPN chart migration stuck.

I found the android/data/opencpn/charts/files folder with the PC and it was empty.


I copied the original subset folder contents from the SD card to that folder.
I re-installed OpenCPN from the play store.
In Settings/charts I added the folder (I think! I am not sure whether to give it OK or Apply, so I did both)
Exiting settings I got the same "need to migrate" message, so followed the instructions with the same result, stuck with 2 secs remaining time.


I again checked the android data folder (see pic) and it has the same contents as the original CM93 subset folder.


Brain fog stopped further play.
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Old 12-01-2025, 07:37   #9
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Re: OpenCPN chart migration stuck.

Don't use add when choosing at the beginning.


Use migration and then select the folder where your charts are located. Then in the next window grant permission to migrate.


It should really work without involving a PC.
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Old 12-01-2025, 07:44   #10
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Re: OpenCPN chart migration stuck.

Every time I use Migration it fails to finish and thre app remains suspended so i cannot do anything more without re-installing the app from the store.


It seems to me...
1. Migration is not sending anything to the android data file.
2. Manually loading the file should avoid the need for migration but the App does not see it.
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Old 12-01-2025, 07:48   #11
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Re: OpenCPN chart migration stuck.

Quote:
Originally Posted by OndinePLC View Post
Every time I use Migration it fails to finish and thre app remains suspended so i cannot do anything more without re-installing the app from the store.

On my previous phone Samsung S20 Ultra it took hours to migrate CM93. Screen went black in between and I thought several times it had crashed.

Eventually I let it jug in with it over night and it was done in the morning.

On the new Xiaomi it takes about 30minutes for CM93 and a lot of MBtiles.
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Old 12-01-2025, 09:02   #12
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Re: OpenCPN chart migration stuck.

Ondine....


From the screenshot, you have found the correct charts directory.
However, the contents look very small. There should be many subfolders there, each containing lots of files. Unless you are using a custom cm93 subset....


If you have the original charts on the PC, just copy them to the "Charts" directory. Then start OpenCPN, and "add" the directory in Settings->Charts->Chart Files.


If necessary, you could grab the charts from an older phone, again using USB cable and PC.


Thanks
Dave
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Old 14-01-2025, 07:05   #13
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Re: OpenCPN chart migration stuck.

I compared the CM93 subset on the SD card to the original in the PC and they are identical. They do have subfolders A<B<C etc and many other files (about 40Mb).

On the PC Opencpn I selected the subset, but it would not display the detailed charts. Somthing of a surprise because it used to work on the PC (though normally i use the full CM93 on the PC) and also on the old phone (which I no longer have available to check) and I doubt both versions coud have got corrupted.

Perhaps updates to the PC and Phone version had made it obsolete?

Anyway I tthen loaded the original PC CM93 working folder onto the phone android data charts folder, (took around 4 hours) and it now works OK.

However I will recreate a new Caribbean subset of CM93 and load it on the phone - CM93 takes up about 5 GB of internal storage on the phone, while the subset only 40Mb - and if it works I can eliminate the big folder.
Meanwhile if I end up at sea anywhere in the world I won't get lost!

Ideally i would like the charts to be on the SDcard, but I suspect that is no longer possible?

The issue remains of why the migration process ended up freezing the appp instead of aborting with an error message?

Thnakyou very much everyone for your invaluable help. CF at it's best.
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