There are several GPS navigation units. To name a few of the popular units: Tomtom, Garmin, Kenwood, Motorola, and Magellan. You can find a full list of the top 5 here: http://reviews.cnet.com/best-gps/
Garmin and Tomtom are both reputable brands of GPS navigation system.
From portable and in-dash navigation systems to marine, handheld and fitness GPS navigation
Depends on the technology its built with: early 1980s technology military GPS navigation units took one to two cubic feet of space, modern GPS navigation units can be as small as a stack of 3 or 4 credit cards.
As all gps type electronics the connection is not as strong during a storm because of the clouds and the static atmosphere. However, the gps navigation units will still perform well.
The cheapest GPS units include some of the Tom Tom units with less features. Top recognized brands on the market include the Tom Tom GPS and the Garmin GPS units.
Garmin is well trusted, and frequently advertised. It is one of the top selling GPS navigation systems available. You can buy a Garmin, as well as browse other brands online and in person as Best Buy.
There is a dvd and a owners manuel that comes with your new gps navigation system. Additionally, you can look for videos online that can help you understanding your navigation system.
No, nokia is known only for their cellphones not GPS'S... if you are looking for a good gps get Garmen or TOMTOM.
Most brands and styles of GPS units come with these features.
Garmin is the most popular motorcycle and overall most popular GPS system. There are also brands such as TomTom and Teletype that sell GPS for motorcycles.
The most sold garmin navigation gps system is the gps nuvi 1222. It was released in 2011 and has sold the most units in the quickest turnover time; currenlty sold out.
Magellan is just the name of a company that makes brands of GPS systems. They make car, handheld, and mobile GPS navigation systems and they are used the same way as any other brand of GPS systems.