A GPS is a compact, handheld device that serves the purpose of navigation. It helps pin-point directions to a certain location. They can also be used to determine the precise location of an individual/asset during an emergency situation. Being lightweight, these devices can be taken along for hiking, fishing, climbing or mountaineering. Nowadays, GPS devices can be seen in almost every other gadget as a standard feature. Cars, mobile phones and watches usually have integrated GPS systems.

How Do GPS Maps work?

GPS satellites basically calculate the position coordinates of a certain person/asset and displays it on a map. GPS satellites are a great help during land surveys, military exercises, map creation etc. These satellites can pinpoint a location up to a few meters. The process involves calculating precise coordinates of a GPS receiver. This is known as 3-D Trilateration. Distance of the traveling signal is processed through 2 or 3 different satellites and exact location is found within a matter of minutes.

There are various things you can find on GPS map. These include road maps displaying traffic information including street names, speed limits, traffic flow, route, highways, U-turns, and location of parking lots. Also, users can see ‘points of interest’ and ‘Waypoint’ on the map. These maps are usually revised once a year. New locations and street addresses are updated frequently.

One latest feature that allows users to interact through GPS systems is the Point of interest. This allows users to tag information about a certain location/point on the GPS map. For example, if you like a particular Chinese restaurant and wish to tell people about it, you just add a good review of check that as point of interest.

This can be done for many other things such as best hospital, lakes, shopping malls, clubs, getaways, scenic locations etc. You name it and tag it. Other people, those who are new in town, can use this information to check out the happening points in a city. Hence the name, points of interest. It is different from a waypoint in the sense that it is more interactive and mentions personal interest of another GPS user.

While buying a GPS navigator, it is essential that you check out whether some of the basic functions are available or not.

• First of all, check the accuracy of the GPS navigator. Normally, a satellite based GPS is accurate to within 4-5 meters of the entered location.

• Next thing – check how many points of interest are displayed on the screen. Is there any other additional information about the location displayed on the screen? Is the information correct?

• Design and ergonomics of the GPS navigator should be well suited to the application. A system that is to be used in a vehicle should be well built.

GPS devices have emerged as a handheld device that benefit during both recreational and outdoor activities. The development of the GPS has completely changed the way we travel, shop, and enjoy leisure activities. So, while shopping, chose carefully and keep your requirements in mind.