external gps? will it allow me to use laptop for mapping?

[Nosey]

will the external gps program/setting on the diamond allow me to hook it up to my laptop for gps mapping?

I do not have a data plan so I can not use the ota gps mapping programs (google/live/etc) but I have ms streets and trips (2006) that has an option for hooking up an external gps

I've been playing with the external gps program settings and can't get streets and trips to see it

is this due to the inability to do this or is it due to just not getting the correct settings yet?

or if anyone has an alternative or better way to get gps'ing w/o a data plan or paying a bunch of cash for another program

thanks in advance