owners of the garmin nuvi line of gps navigation devices can create their own personal vehicle icons to supplement or replace the vehicles that ship with the unit. i've had mine (a nuvi 350) for over a year and the moment that i learned that i could craft my own custom vehicle i knew i had to have my very own batmobile!
the process can be broken down to two basic steps: 1) creating the source images and 2) combining the images into a single file that can be converted into the file format the nuvi uses for the icon.
unlike other gps units which use a single static image of the rear of the vehicle, the nuvi uses an image array to generate an animated icon that can be viewed from 360 degrees. it really doesn't matter how you create the source images: you could draw them and scan them in or create them in a paint program. for this exercise i'm going to show you how i used photographs of a model car to make the icon. i've also used 3d models to create other icons.