The PNTA has good downloadable maps. I was just informed recently the PNTA isn't going to make GPX tracks available at least until some issues have been worked out. There are several new re-routes in the works so do check the links below.

New information from the PNTA:
Main PNTA Site
PNTA Maps
PNT Trail Alerts This doesn't seem to work, just get a picture
Link to make comments or for sending updates

Links to Latest Books:
Tim Youngbluth's PNT Digest
Tim Youngbluth's PNT Data Book
Melanie Simmerman's PNT Town Guide 2022 Version is now out