This is an extra long communication cable that mates with the GP-735, GP-635, EM-506, EM-406a and EM-401 GPS receivers. This is ideal if you have a UAV project where the GPS module may be some distance away from the controller board (such as the UDB5). The 1-foot long cable has two 6-pin JST connectors with a pitch of 1mm (0.039"). It is wired 1:1.
Of course, because it's just a 6-pin cable with JST 1mm-pitch connectors, you could use this for other things. It doesn't have to be for GPS use.