Garmin GPS models vary by screen size, location coverage, ability to update lifetime maps, traffic compatibility, applications and other special features. Speed limit indicator, voice commands and lane assist are some of the additional applications present only in some models.
Battery longevity, price and the wireless communication technology that allows for the installation of additional navigation features are some of the other distinguishing factors that differ between models. The locations covered by a model also differ in number and the ability of the given model to update the current lifetime map. There are varying physical designs; some are ultra slim, while others are compact. Their sizes determine their portability, readability and safety. Several of them have bigger screens to enhance viewing, but the rest have relatively small screens. It is also easy to distinguish the optimal functioning, given that quite a few of them come with special or upgraded applications. Although certain special features such as voice command and lane assist are common, several models have a better edition that voices the name of the street in addition to giving normal commands for turns. Some Garmin models indicate the suitable lane for each turn and display it to the driver on a split screen.