Thanks for the help Timothy!
Using some Garmin software on the computer, I have been able to seen the data on the Hyper Terminal with the flow control set to "hardware" and also to "none." I don't think I'm using a RS232 converter chip (which means I'm probably not). How would I go about finding/using one of these? Is it complicated?
I really hope that this may be the last missing piece to this project!
Alex