GT-11 to computer .......... Help!!!

Thats what I thought at first but a bit of testing showed that both tabs download the Data Logger internal memory file. One tab gets it as the raw .sbp file and the other converts the data into the other formats.
The data logger is a continuous file. It will just keep adding to it every time you turn the unit on. This is why I 'save to card' and then clear it before every session. But it does have the advantage of making a single file for that session even if I turn the GPS off during the session for a while.
On the other hand. The .sbn file created on the SD card makes a new file every time the GPS is turned on. This is why you have separate files for each day, or session, or multiple files for a day where you turn the unit on and of during that day.
The different logging characteristics can be used to advantage depending on what you want and how you do it.

It's a bit unclear to me what's happening with the internal memory, there's still the option of turning the internal memory on under "tracks". As well as "data logger" I was under the impression "tracks" still recorded in the old formats and data logger in .sbp.
Could it be that "logger data" reads the data logger, and Navi data reads the track data???

If that's the case, then having both internal formats recording, should severely reduce the record time.

Hmmm... I haven't payed much attention to the 'Track' menu. I will do some experiments next time I sail and see what I get.