Here is what I asked Tom Chalko:
1. IS THERE ANY POSIBILITY TO GT31 got i DATA LOGGER options for Logging Enable & Logging Disable, or Logging ON, Logging OFF ?
set MIN SPEED to any value you want. Logging will take place only when you move above this speed2. Is there any other way to got few separate sessions in one day, and not using for that russian method of switching device OFF and ON again ?
it is the simplest method.
But, why do you want few sessions per day? It is MUCH EASIER to deal with 1 file per day.
I leave my GT31 running for 20 hours, but I use MIN SPEED settings.
Use MIN SPEED settings. There are 2 min speed settings, one for SD card and one for the Data Logger.
You are the only person in the world who wants "separate files". hahahha
It is MUCH EASIER to deal with 1 file3. new option in MISC: DELETE>DEL ALL a clearing only flash memory, not SD card, right ?
yes. SD card is not touched.
Doppler: you cannot turn Doppler OFF.
GT31 does tracks and Doppler together all the time.
AND HERE IS MY PAGE DEDICATED TO SETTING UP GT31 AND SOLUTION
HOW TO MODIFY AQUAPAC FOR US WITH SMALLER HANDS :)
Link: http://windsurfing-koprivnica.net/page.php?94
CHEERZ 
I just underpart of aqua turn inside and fix with glue, also, I shorter the armband for cca 10 cm, and replace band tapes, as my picture shows http://mtbest.net/setting-up-navi-GT31.htm
I's hard for me to explain in english but I guess you will fugure out from photos
also check out this homemade armbands: http://www.windsurfing-koprivnica.net/e107_plugins/autogallery/autogallery.php?show=Ostale%20Slike%2FTorbice%20GT-31
We do that for only one reason, becouse aquapac are TOO BIG, TOO UGLY
Cool will be that will be one model of aquapac only for GT, but at this point for me, aqua is to big for that device, and smaller model don't fit GT in
Stupid thing is also that both models are TOO DEEP and we with smaller hand, got some stupid bad from shoulder to half of aour arms :(
Why they don't have shorter and wider models ??? Why they do that bags so long ??? I just don't like it, I can't help myself
THAT IS COOL: 
&newwindow=1
Over here we have a nice bag called "paqua midi" Just the right size, and the outside plastic isn't tight over the toggle, so it gives you some chance of operating the thing in the pack.
JP747 (from the philipines) also makes a nice pack, if you can't find the paqua midi over there, PM jp747.
hehhe, i suppose he don't send to Croatia :)
have any links of that products, both of them ?
YEAH I find it H2OTEK: www.seabreeze.com.au/Members/Profile/Details.aspx?member=jp747
Well JP posts to Aus, I suppose it's a bit further to you.
Here's the paqua site.
www.paqua.com.au/paqua_range.htm
