GPS navigation devices:



A GPS navigation device is any device that receives Global Positioning System (GPS) signals for the purpose of determining the device's current location on Earth. GPS devices provide latitude and longitude information, and some may also calculate altitude, although this is not considered sufficiently accurate or GPS navigation devicescontinuously available enough (due to the possibility of signal blockage and other factors) to rely on exclusively to pilot aircraft. GPS devices are used in military, aviation, marine and consumer product applications.

GPS devices may also have additional capabilities such as:

* containing maps, which may be displayed in human readable format via text or in a graphical format
* providing suggested directions to a human in charge of a vehicle or vessel via text or speech
* providing directions directly to an autonomous vehicle such as a robotic probe
* providing information on traffic conditions (either via historical or real time data) and suggesting alternative directions
* providing information on nearby amenities such as restaurants, fueling stations, etc.

In other words, all GPS devices can answer the question "Where am I?", and may also be able to answer:

* which roads or paths are available to me now?
* which roads or paths should I take in order to get my desired destination?
* if some roads are usually busy at this time or are busy right now, what would be a better route to take?
* where can I get something to eat nearby or where can I get fuel for my vehicle?

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