[aprssig] Data cable for Garmin GPS V

[Earl Needham]

         Looking for information on building a cable to connect my 
Garmin GPS V to my HamHUD.

         The GPS V has four pins --
         + -- for power input
         - -- for power ground
         Data in (for DGPS receiver, etc)
         Data out (to TNC)

         It's been several years since I built one of these -- isn't 
there a "data ground"?  And does it simply connect to the same pin as 
the "power ground"?

         And -- which pin on the DB-25 is meant for data in?  Data out?

         Thanks,
         Earl

KD5XB -- Earl Needham
Clovis, New Mexico DM84jk
http://groups.yahoo.com/group/cw_bugs
Quoting from the Coast Guard: ZUT