A little Garmin history (more than you wanted to know) of the Street Pilot:
The first Garmin StreetPilot was introduced at CES 1998. It featured a 240x160 black and white screen and a database of nearby services and attractions, with on-screen routing. A revised model with 240x128 color screen, the StreetPilot ColorMap was introduced soon after, adding information on services available at highway exits. The devices used 8MB or 16MB cartridges, onto which mapping data was loaded from the user's computer, at a chosen detail level (8MB covered the Atlanta Metropolitan Area at high detail, or a greater area at highway-level detail).
The successor model was the StreetPilot III in 2002, which had a 3.85" 305x160 color screen and added voice prompts, so that drivers would no longer be required to look at the screen for instructions. It came with 32MB or 128MB (Deluxe model) data cards, on to which the user would load his required mapping, plus a base map featuring major highways.
The 2610, 2620, 2650 and 2660 models were introduced in August 2003, with 3.7" 305x160 color screens, and featured for the first time touch-sensitive screens, as well as a CompactFlash Type II slot. The 2610 and 2650 models were supplied with maps on CD plus a 128MB CF card, while the 2620 and 2660 models had no CDs, because maps were pre-installed on the 2.2GB Microdrive. They also added multi-stop route optimization. The 2650 and 2660 were required to be fitted to the car by a professional installer, and had a reversing light sensor, speed sensor, and angular direction sensor, to boost the system's accuracy, plus dead reckoning capability.