The world belongs to satellites. Cellular communications, military tracking solutions, and everyday direction finders all rely on satellite relays. All cellphones, laptops, netbooks, and GPS navigational units triangular and relay your position and phone calls via sub-orbital satellites. When once they were used as spy satellites (and may still are), today they relay and convey more mundane conversations, directions, and information.
Garmin is a top ranking manufacture of GPS systems. Their products are made to endure and are some of the best quality systems that are available. They have several different charplotters to choose from. All of which are made to meet standards that are above most other systems.