As the Global Positioning System – or GPS – continues to rise in popularity, a host of GPS-related products continue to hit the shelves. The GPS receiver is an interactive map that can show you exactly where you are at all times; this can be enormously helpful when finding your way around unfamiliar surroundings.
GPS was initially launched by the United States Department of Defense in the late 70’s when the first operational satellite was sent into space. By the mid-90’s, 24 satellites circled the earth and continue to be in operation today. What was originally designed for use exclusively for the military, now functions as a navigational system for military and civilians alike. More and more consumers, eager to take advantage of the timely and accurate information supplied by this network of satellites, choose to have GPS navigational systems included as standard equipment in their new vehicles.
But portable GPS has become just as popular. The GPS receiver is a compact navigational system that literally fits in the palm of your hand. The GPS receiver interfaces with the government’s network of satellites and can instantly perform a series of latitudinal and longitudinal calculations that can precisely target the user’s location. The screen of the GPS receiver displays a map of the area – including roads, landmarks, and other points of reference – and the user’s location in relation to it.
For outdoor hobbyists the GPS receiver has been enormously beneficial, allowing them to navigate possibly unfamiliar terrain without ever losing their bearings. Travelers who may not be using one particular car can still access satellite navigational information through the use of the GPS receiver.
The GPS receiver comes in a variety of styles and is manufactured by numerous companies. The models can be differentiated largely by price and included features. For anyone interested in a GPS receiver, certain things must be considered prior to purchase including manner and frequency of use. Those who plan to use their GPS receiver may be interested in those models that have a greater range of features. While this particular GPS receiver will likely come at a greater price, it could be well worth the investment to ensure safe and enjoyable travel. It’s wise to research each GPS receiver before you make a purchasing decision. But no matter which model you choose, you will likely find a GPS receiver to be a convenience you become used to very quickly.
By: Michelle Bery
Posts Tagged ‘Unfamiliar Terrain’
Using A GPS Receiver
December 23rd, 2009Posted in Article
Tags: Bearings Civilians Department Of Defense Global Positioning System Gps Map Gps Navigational Systems Gps Receiver Hobbyists Interactive Map Landmarks Navigational System New Vehicles Operational Satellite Palm Of Your Hand Satellites Shelves Unfamiliar Surroundings Unfamiliar Terrain United States Department United States Department Of Defense
How GPS Works
October 4th, 2009
Global Positioning System (GPS) is a navigational aid originally developed for the military. The system simply receives signals. It is the applied technology that gives the GPS its versatility.
If you have ever used map and compass, you will understand a little about how the GPS works. In order to find your position on a map, you need to have three points of reference. The intersecting line from the reference points is where you are. Map and compass work uses triangulation (bearings), GPS uses trilateration (distances) to calculate location. Satellites orbiting the earth emit unique signals that can be received by a GPS. The GPS software interprets the signal, identifying the satellite that it came from, where it was located, and the time that it took for the signal to reach the system. Once the receiver has both time and distance it begins to determine position.
Three satellites provide the intersection point and the fourth is used to check that the positioning is accurate. Accuracy depends upon the synchronization of atomic clocks in the satellites with the clock in the GPS system. Although the clock in the GPS is not
atomic, utilizing the fourth satellite gives it that functionality as the internal clock adjusts itself to correct any discrepancy discovered.
GPS has gone far beyond its initial military application. Drivers can find their way through city streets, long distance trekkers use the technology to cross unfamiliar terrain, mariners and pilots use GPS enhanced data to cross the seas and skies.
In–vehicle GPS can be integrated into the car entertainment system or can be installed as a removable device. These systems need to tell the driver where he/she is and how to reach their destination. The information includes road directions plus relevant features along the way such as rest stops, gas stations, points of interest, etc. Auto GPS uses voice commands so that the driver can concentrate on the road.
Hikers and trekkers use similar technology, but normally without the inclusion of road systems on their devices. Mapping software defines the territory that the hiker will encounter. The user can enter waypoints (points of reference) so they can return using the same route. They can add points of interest such as water sources, possible campsites, and other items of interest on their trail. However, the portability demanded by hikers will also limit the functionality of the system as small screens mean that some detail will be lost.
It is GPS technology that is used to track individuals on home arrest, to trace missing pets, stolen vehicles, and missing people. Small systems can be incorporated into pet collars and wristwatches. As long as the receiver is active, it can be found.
Marine and aviation GPS units are sophisticated and specialized. The principles involved are the same as any standard system; the software is much more highly developed.
Any fisherman, who is using a fish finder on his boat, is using a GPS that is enhanced by sonar and tracking devices. Units have been developed for use on float tubes also -– as GPS technology advances, the systems become more and more compact and their uses
more and more extensive.
If you are considering purchasing a GPS, make sure that it can be updated easily. This is especially true if you buy a multi–function GPS or one that is used where conditions change regularly. An in–vehicle GPS soon loses its usefulness if it is not updated as road systems change.
Updates vary according to the device being used. They can come in CD/DVD packages or as computer downloads. The user can purchase maps specific to the area in which the GPS will be used or a range of maps and routes. These are available from GPS software
companies who will charge proportionally to the sophistication of the software.
GPS units vary in price according to their usefulness. It is possible to buy units for less than one hundred dollars to units costing more than one thousand dollars. What your needs are
will be a factor in the cost of your unit. If you are a backpacker then portability is a major consideration. If you are a trucker, you need to be able to find a delivery point as quickly and conveniently as possible. Whatever device you go for, cost is generally related to quality. Buy the best you can afford.
By: Anne King
Posted in Article
Tags: Atomic Clocks Car Entertainment System City Streets Compass Work Global Positioning System Global Positioning System Gps Gps Software Gps System Internal Clock Intersection Point Military Application Navigational Aid Reference Points Relevant Features Rest Stops Road Directions Time And Distance Triangulation Unfamiliar Terrain Voice Commands
