GPS modules

Other GPS devices need to be connected to a computer in order to work. This computer can be a home computer, laptop or even a PDAs, or smartphones. Depending on the type of computer and available connectors, connections can be made through a serial or USB cable, as well as Bluetooth, CompactFlash, SD, PCMCIA and the newer ExpressCard.[5] Some PCMCIA/ExpressCard GPS units also include a wireless modem.[6] Devices usually do not come with preinstalled GPS navigation software, thus once purchased the user must install or write their own navigation software. As the user can choose which navigation software to use, it can be better matched to their personal taste. It is very common for a PC-based GPS receiver to come bundled with a navigation software suite. Also, GPS modules are significantly cheaper than complete stand-alone systems (around 50-100 €). The software may include maps only for a particular region, or the entire world (if software such as Google Maps, Networks in Motion's AtlasBook mobile navigation platform, etc. is used).

Some hobbyists have also made some GPS devices and open-sourced the plans. An example is the Elektor GPS units. These are based around a SirFStar 3 chip and are comparable to their commercial counterparts.
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