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US $6.99
GPS stands for Global Positioning System and the system refers to a network of satellites orbiting the earth and transmit information constantly back. A handheld GPS is a GPS navigation unit that is very mobile and can receive information from satellites to locate certain places on the ground in air or water.
The three parts of GPS
GPS consists of three parts: space, control, and the user. Space refers to satellites, control refers to the control stations on earth, and the user is the person who operates the GPS.
Satellites
Currently, there are 24 satellites orbiting the earth once every 12 hours. They were initially launched by the U.S. Department of Defense for military purposes, but they are now also used civilian purposes. A GPS receiver must be locked into at least three satellites to give a 2D position of longitude and latitude, and four or more satellites to give a position 3D longitude, latitude and altitude.
When the GPS receiver position has been determined, other measures may be calculated as the speed of the user is traveling, the trip distance, bearing, and also information on sunrise and sunset. If the user enters their destination, the distance to the target can also be monitored.
Monitoring stations
At present there are eleven ground control stations tracking the satellites and send data on the master control station. With eleven control stations, each satellite can be seen by two or more monitoring stations. There are plans for five more control stations which means that each satellite will be seen by at least three of them.
User
The user in the system each individual is in their handheld GPS receiver. Users of handheld GPS receivers may include hikers, boaters, pilots, fishermen, hunters, military, or for geocaching fun. Basically, they are useful for anyone who wants to know exactly where they are at a time or know where they going.
What is the accuracy of GPS?
Today, GPS receivers are more accurate than ever, but they can not always be 100% accurate. Common handheld GPS receivers can track your position from 3-15 meters, but there are errors that can affect accuracy. Some of these errors are caused by the delay of the signal during its passage through the layers of the atmosphere, the signals reflected from tall buildings or the Rocky Mountains which extends the life of the signal to reach the receiver, or the number and position of satellites other.
What to look for in a handheld GPS
One of the features that are useful in a handheld GPS is that it should be waterproof. Whether you're hiking, fishing or boating, if it falls into the water and it is not waterproof, it will be ruined. You may want to consider if the GPS works with disposable batteries, rechargeable batteries, or those with an internal battery that can be recharged at home. Several factors may also be charged an adapter charger car or via a USB cable.
Some GPS receivers under $ 100 cost while others can cost several hundred dollars - while depends on how many features you need. Some have removable micro SD card can be charged with mapping and points of interest. It is also possible to buy micro SD cards that are pre-loaded with maps, maps of inland lake, marine cartography, and the city maps. Other characteristics may include barometric altimeter, electronic compass, data on tides, and some even include a digital camera.
Michael Tait has been writing articles on the Internet for several years now. He writes about his many interests, like technology and electronics, so check out his new website at Portable eBook Readers which lists the features as well as the pros and cons of the many ebook readers, like the Cybook Gen 3 and Cybook Opus readers from Bookeen.
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