Automotive aftermarket portable GPS units

The self contained aftermarket portable units offer most of the features that are offered on the built-in units. The portable units usually lack the larger display size that the built-in units enjoy. However, these units can be shared between cars and usually have all the features present in built-in units. Also, it is much cheaper than what the car makers charge for the built-in units. The prices range from $100 to around $800 for the premium models. The higher end models include voice recognition, live traffic updates, and Bluetooth connectivity. The primary drawback is that you have to set up a secure station for these portable units so they don't interfere with driving safety.

Aftermarket in-dash system

These units are installed by professional on custom bases. It is for people who wish to have the in-dash unit for their new car or older car that did not come with one. The GPS unit is usually a part of package that contain premium entertainment system that include DVD player as well as large touch screen. If you are purchasing a new vehicle, it is recommended you buy the factory installed in-dash unit as aftermarket in-dash system will most likely cost more than the option offered by the dealers.

Cellphone

Some cellphones are capable of GPS navigation. Some carriers such as Sprint, At&T, and Verizon offer turn by turn navigation at extra charge. Unlike smart phones and PDA, these cellphones don't contain internal mapping software or access to POI (Point of Interest) database. This is due to small screen and memory capacity as well as speaker quality. Instead, they offer turn by turn voice navigation. Some Carriers offer other services that can track the cellphone via GPS service such as Family Locator by Sprint.

Smart phone and PDA

Most of the newer smart phones and PDAs contain internal GPS unit. GPS unit manufacturers such as TomTom and Garmin offer software for certain smart phone and PDA models. The primary drawback is the size of the screen compared to portable and in-dash units. Also, the battery drain can be a big burden on some models as these devices are intended to be used as PDA and phone as well. This is a good solution for business travelers who need to travel frequently.

Map software and GPS receivers for computer

You can add GPS unit and software to your laptop to use it as navigation device. Known as RS232 receiver or GPS mice, you can attach these device to your laptop or even Pocket-PC or other type of PDA. These come in Bluetooth format as well as USB device. This might be practical if you have PDA or Pocket-PC devices that lack internal GPS. However, connecting it to your laptop for navigation use might not be practical as carrying laptop for sole purpose of navigation can be burdensome.

Handheld GPS hiking device

Handheld GPS hiking devices are a GPS unit specifically designed for people who enjoy outdoor activities. The devices are usually made of sturdier materials to withstand occasional drops and bumps. Also, it includes other features such as altimeter and compass. Also, certain models will allow trail mapping as well as sharing these mapping with other units. These GPS unit might be an essential equipment if you are hiking in an unfamiliar area for safety reasons. As these units have specific use, they don't include features such as turn by turn navigation or point of interest database.