- post the Perl code of your UDP server.
- post the details of the GPS unit (make, model, link to online docs, etc.)
- most importantly, post a *useful* output example. Perhaps by writing the "results" to a file, and then running `hexdump` or `od -t x1` on the file, and then posting *that* output, inside <pre></pre> tags.
I doubt that your GPS is sending encrypted data; it is probably just using some dense format that is not easily human-readable. Perhaps mentioned in the unit's documentation?