Magellan 980588-01 - GPS Companion For Palm V/Vx Using Manual page 29

Adding Maps
You add maps using the HotSync procedure that came with your Palm OS Handheld. For more
information on using HotSync consult the user's manual that came with your Palm OS Handheld.
You can install as many maps as will fit into your organizer's memory. Maps vary in size from less
than 5K for a small city to upwards of 800K for really large cities or counties.
Map files always end with a .pdb filename extension and contain the name of the area they cover.
For example, the map for San Francisco has a filename of San_Francisco.pdb .