OT:How to Connect GPS to Laptop?

["Thomas H. George" <lists@tomgeorge.info>]

I have an old Magellan 315 GPS which I would like to connect to a laptop
with only USB ports (OLPC).  Checking the Debian packages I see three -
gpsman, gpsd and gpsbabel - which can understand the NMEA ouput from the
GPS.  

I would appreciate any guidance or references to adapters needed to make
a working connection.

Tom