Non-mapping handheld GPS units
Non-mapping handheld GPS units are designed to compute basic GPS information only.
Some units have display screens, while others do not. Those without display screens have to be connected to laptops or PDAs where information can be displayed.
Some non-mapping handheld GPS units can record certain routes for future use.
They are generally inexpensive and can work well with paper maps. They are ideal for geocoaching and helping lost people get back home.
Mapping handheld GPS units
Mapping handheld GPS units have built-in screens for displaying maps and other information. They show the user's position on the map and relate it to the surroundings. They also have all the features of non-mapping GPS units.
Most mapping handheld GPS units can display rudimentary road level maps only, while the more expensive models can feature detailed topographic and street level maps. Most models require regular road map upgrades.
Auto-routing handheld GPS units
Auto-routing handheld GPS units are the most advanced GPS units available. They provide automatic door-to-door route displays and navigation assistance. However, most models lack the basic features of handheld GPS units and only feature auto-routing road solutions. They are ideal for travelers who are not very familiar with GPS but need the assistance of automatic devices, those who easily get lost on the road, and those who are interested in door-to-door routing.
Some auto-routing handheld GPS do not have voice prompts and only beep when a message is on the screen. Some models are combined auto-routing receiver and mapping receiver units. | 
