Often when choosing a brand new cellphone or a satellite GPS device we face with the question about what options are most important and in this case we need some GPS buying tips. First, in accordance with the tasks you need to decide from which group you need GPS navigator. They can be divided into the following groups: compact devices that can easily fit in the palm; they can be carried in your pocket and do not take up much space in your backpack. Handheld devices - these are devices with somewhat larger dimensions, as a rule, the larger screen, as well as the opportunity to work with external antenna.

For carrying of navigators of this group you can use special cases with belt clip. Next group - these are stationary devices that are placed on the dashboard of a car or in an enclosed cabin. These navigators usually work with external antenna and have a large black and white or color screen.

And the last group in our GPS buying tips - these are professional navigation systems, or otherwise - map-plotters. These devices often work in one system with sonar, radar and autopilot. For installation they require a lot of space, so they are installed on vessels of more than 5 meters. Selection of devices in this group is very large. Within each group there are wide variations between simple and more complex models. There are devices that show your location and movement on the background of the graphics card. This card is loaded with a computer disk and can be stored directly in the internal nonvolatile memory device, or on the cartridge with different capacity (from 8 to 256 megabytes). Some navigators do not have the ability to download a map, but in the memory device has a database of locations of the globe. In memory of the specialized devices there may also be information about the objects of the marine / air navigation.

Giving GPS buying tips it should be noted that navigators can also be distinguished by the design features of the antenna. There are devices with built-in antenna, and they work only with it. These are all models of the first group. There are devices that work with internal antenna, but with an additional socket for connecting the remote antenna. This allows us to work with the device from the closed metal cab boat or ATV. There are very exotic navigators, which are the actual antenna. They do not have a screen, and they are intended to convey information about the location on the radar screen or computer.

Useful feature in new models - it is built-in electronic magnetic compass and barometric altimeter. The first is for orientation to the cardinal points, regardless of satellite signals, the second - to determine the height above sea level by atmospheric pressure changes, as well as for tracking the history of changes in atmospheric pressure. With the altimeter you can keep track of how varied the height above sea level during the movement along the route, looking at the graph on the screen of the device. Almost all devices have output for computer use, i.e. can transmit data in real-time for location tracking and just to store the data in the computer "just in case". After reading GPS buying tips you will probably be able to choose the GPS navigator which will be best for you.