Gees, I bet you had a dollar for every time a question gets asked about setting up a GPS!
My problem is I'm trying to format the SD card (in the memory card menu), but it wont let me - it says "turn off log first". How do I do this.

Also I'm trying to set the NMEA Items to SBN 1 Sec, but this isn't in the list - it has SBN Off. I click on this but nothing changes.

Also I set the Map Datum to Aust84, is this correct?

Thank you in advance for your generous patience with yet another techno inept windsurfer.

I feel your pain Easty

The reason it won't format the SD card is because it is logging data to it.
Soo.. you have to turn it off Memory card> log switch>off
Then format card
Then turn Memory card> log switch>on-fix

Nmea items click scroll down to SBN move joystick side ways to get to 1sec

Map datum WGS84 don't know why

Tom Chalko has his settings here http://mtbest.net/setting-up-navi-GT31.htm

Thank you lao shi, excellent instructions.