"http://wiki.answers.com/Q/For_what_initial_use_were_GPS_devices_developed"
These devices are mainly used in boats. These devices use GPS to track you on the body of water you are currently in in your boat. They work similar to GPS systems used in cars.
Handheld GPS devices have been around since the late 1990s, becoming popular in the early 2000s. They were initially developed for military and professional use before being adapted for consumer and recreational use.
GPS signal jammers are portable devices that literally means gadgets that stop a GPS tracking device from receiving the signal that without which they cannot pick up their position. They emit their own signal at the frequency that GPS tracking devices use, which confuses or blocks other GPS signals.
You should be able to use a marine GPS chartplotter anywhere. The whole point of GPS devices is to help navigate and plot where you are.
No, other than the GPS devices, there are no other vehicle tracking systems that are in use. You can see the latest inventions at en.wikipedia.org/wiki/Vehicle_tracking_system
The first prototype of the Global Positioning System (GPS) was developed by the U.S. Department of Defense in the 1970s. GPS was made fully operational in 1995 and made available for civilian use, providing accurate global positioning and navigation services. The technology behind GPS involves a network of satellites orbiting the Earth, which transmit signals to GPS receivers to determine precise location, speed, and time information.
GPS devices use satellites.
No, there isn't a monthly fee for Garmin GPS units. There many be additional charges for GPS upgrades though, aside from the initial cost.
III GPS performs very well and has greatly improved efficiency rates from II GPS. Most modern GPS devices including cell phones and satellite navigation systems use III GPS.
Yes, all apps work on both devices, the only exception are apps that use GPS since iPod Touch doesn't have GPS signal receiver (and older versions of both devices sometimes have trouble too).
SiRF Technology, Inc. was a pioneer in the commercial use of GPS technology for consumer applications. The company manufactured GPS navigation software, and GPS navigation devices.
Are you looking for a GPS device to use in the United States? If so, you might want to consider one of the Garmin GPS devices that are configured for the USA. These devices are configured so that you can travel anywhere in the United States with your GPS device, and it will get you wherever you need to go because it is loaded with all of the streets, businesses, residences and landmarks in the USA.