An improved GPS navigation receiver for converting range and range-rate
information from microwave radio transmissions from orbiting satellites
and for determining a position of the receiver from a processing of the
information and an output connected to provide the determined position on
a display. The improvement comprises a database of maps stored in a
portable document format (PDF) file independent of any hardware, software
and operating system used to create it. The PDF file provides for a
description of documents including any combination of text, graphics and
images in a device-independent and resolution-independent format. The
database is connected to output selected ones of the maps on the display
with hypertext access on points-of-interest.