GPS Data Logger Software - BT747

Hi,
I have downloaded BT747 desktop Java application. I would like to set the device to make one point every 5 seconds only when I'm moving faster than 3 km/h. It means when I stop at some place the device will be "paused". How can I do that?

There is a problem. I set on tab "Device settings" Log by Speed above 3 km/h and Fix every 5000 ms. Then I click the Set button. Disconnect, unplug device, plug device, connect. Immediately the time box is checked and set to 5 seconds. Itself. Why? I use Holux M-1000C.