Just got my GT-31, not very fast 25knots so far... Joining up to the team challenge and the www.gps-speedsurfing.com/default.aspx etc

Is it possible to use the GT-31 with gps team challenge and gps-speedsurfing with Linux only? Don't have windows or a mac, and have not had one for long time.

You should definitely be able to grab the file from the SD card, and then analyze it online at www.ka72.com/ You'll need access to a Windows PC if you want to update the firmware on the GT-31, but that's optional.

You can upload your track on www.gps-speedsurfing.com, have it analyzed by the server and then posted on GPS-speedsurfing. Once you've done that you can use the 'upload to GPSTC' feature there to also post it on GPSTC. No need for any programs on your computer, besides a browser.

During my vacation I used just an Android tablet, an SD card reader and the procedures above to post my sessions.

No problems with linux.
I use GPSARpro,

www.gpsactionreplay.com

it runs in java, so all you need is an up to date java. I've tried alternative java, but it didn't work, the linux version of the original Sun micro systems is fine.

unfortunately the free version doesn't do doppler, so you need the pro version.

It's nice to have your own software so you can analyse your results, alphas especially, that's a technical discipline, and seeing if you're going too wide or too narrow, and if you running square, can help.
Ka72 will show your best results, but you can't do detailed analyses

I've tried real speed and GPS results in Wine, looked like they were going to work, but I've been unable to complete the registration process successfully.

I haven't tried the software update utility in wine, in case it crashed and bricked the gps. If you need to do that find a mate with windows.

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boardsurfr said..

You should definitely be able to grab the file from the SD card, and then analyze it online at www.ka72.com/ You'll need access to a Windows PC if you want to update the firmware on the GT-31, but that's optional.

Done this plenty of times. Simplest way to your results.

Finally got some time to do a bit more with this:

Couple questions, I have set up GPSARpro, and my GT-31 with http://mtbest.net/setting-up-navi-GT31.htm guide etc.

I am getting SPN files, etc.

Can I ignore the SBP files, and what are they anyway?

I haven't seen .spn files, are you sure they're not .sbn?

The .sbp files occur when you do a "save to card", this dumps the contents of the internal data logger on to the SD card.
I only do this if for some strange reason the .sbn file hasn't recorded to card during the session.

The internal data logger holds about 7hrs of data, continually over writing the oldest stuff. So unless you've deleted it before the start of session it can hold multiple sessions, you then have to separate.

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decrepit said..

I haven't seen .spn files, are you sure they're not .sbn?

Yep sorry SBN files, I am getting this, I did not realise that are automatically created. I thought the "save to card" created them. I was following these instructions:

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BEFORE SAILING

Power up your GT31. If you have set up the SPEED GENIE as in C2b - GT31 will enter the SPEED menu automatically after it established connections with GPS satellites. SD card Logging activity is confirmed by flashing log indicator. Move GT31 with speed above the threshold you set in step C1c and check it.

You may wish to clear the "history" of your best speed runs, to keep track of your best daily achievements. The best way to do this is enter MISC menu and do 2 things:
1. SAVE TO CARD>SAVE ALL (this will save datalogger data and best run history to SD card)
2. DELETE>DEL ALL (this will clear data logger and history)

If people have had trouble in the past with their card recording, then they'll do the save to card thing after their session. I don't see any point doing it before the session? Unless you haven't had time to process it yet I guess, but in the 6 years I've been doing this, I've only had to "save to card" 2 or 3 times.
I do the "delete all" thing before every session, so I only see the current history.

When I do GT-31 workshops, we talk about this. The SBP files are a good backup, but you should only need to create them if something goes wrong with the process of recording your SBN file.

However, there are lots of "Things That Can Go Wrong":
1) Left your SD card in the computer at home.
2) Accidentally toggled the lock switch on the SD card when inserting it into the GPS.
3) Forgot to switch off GPS before taking out SD card. (Happens all the time at events. People are used to switching off before driving home, but not used to doing it when handing over their GPS at the beach.)
4) Bought a new card, forgot to format it, or it just doesn't work.
5) Using a Micro-SD adapter, and the micro-SD card comes out. Sometimes all the way!
6) SD card full. (Never seen this yet, but theoretically possible.)
7) GPS Crash before file is written. (You may recover some data from the logger.)

Also, it is handy for a quick and dirty way to combine multiple tracks into a single file without using any software.