VMap is the first homebrew vector MapViewer on PSP.

Features:
# Any vector map format (ESRI shapefile only now, other format could be tranfered to it by Mapinfo or 3rd party tools).
# English and chinese font support, most dbf attribute information
could display.
# Configure file (config.txt) for customize map file for your self.
# PSP buttons control map explore and surfing
# A sample map (simple mexico map in ESRI shapefile format)

http://forums.ps2dev.org/viewtopic.php?t=8579