The Garmin Streetpilot C is a mobile GPS device. and gas stations, the device needs to be updated with the latest firmware and GPS mapping information. I have a Garmin StreetPilot c that is several years old. Need to update maps. I have pluged into my computer with a USB cable. My computer uses Windows. Updates & Downloads. StreetPilot c software version as of July 16, Download ( MB). View installation instructions and system requirements. StreetPilot c This download area offers free firmware upgrades for select Garmin® units. These upgrades are specific to the specific GPS units and software. For business owners, an updated Garmin StreetPilot C with the latest software, firmware and settings improves navigation during local or long distance . Note: We suggest to use WebUpdater to update the firmware, language files and other optional software of your GPS. However - like the. The Garmin StreetPilot C GPS device comes preloaded with maps of North America. As time goes on, cities and towns change and expand and new places . Download the latest Garmin StreetPilot c device drivers (Official and Certified) . Garmin StreetPilot c drivers updated daily. Download Now. StreetPilot c Updates & Downloads. c Update Unit Software with Garmin Express. Use Garmin Express to keep your device software up to date.