PAT draws small-scale (world and country-level) physical, political, and statistical maps, and flexibly lists information about world places. It does what a traditional paper atlas does, but interactively. PAT's intended user is the student, hobbyist, researcher, webmaster, or other non-professional. PAT is designed to be portable; it has the bare minimum of operating-system dependencies and is written in stable, well-known C. Any system with an ANSI C compiler and ISO runtime libraries can run PAT. PAT's abstract device model can accomodate any raster device; it comes with drivers for TTY, GIF, JPEG, PNG, X11, GRX, and others. PAT is multilingual and supports Unicode. Program messages have been translated to English and French so far. PAT can be run interactively, or batch-style from the command line and/or with scripts.