The nuvi 260 GPS system incorporates a 3.5-inch touchscreen display.

If you currently have GPS tracking devices that use the AT&T (GSM) network, you may be affected by the 2G Sunset.

GPS Portable Travel USB Plug-in Rapid 12 Volt Car Charger

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  • Android devices use the same global positioning technology as Google Maps and most third-party GPS tools do. This allows users to locate themselves on a map, find and navigate to destinations via detailed directions, and search maps using a number of different methods. This article will teach you how to use GPS in Android with Google Maps.

    There are many sources of possible errors that will degrade the accuracy of positions computed by a GPS receiver. The travel time of GPS satellite signals can be altered by atmospheric effects; when a GPS signal passes through the ionosphere and troposphere it is refracted, causing the speed of the signal to be different from the speed of a GPS signal in space. Sunspot activity also causes interference with GPS signals. Another source of error is measurement noise, or distortion of the signal caused by electrical interference or errors inherent in the GPS receiver itself. Errors in the ephemeris data (the information about satellite orbits) will also cause errors in computed positions, because the satellites weren't really where the GPS receiver "thought" they were (based on the information it received) when it computed the positions. Small variations in the atomic clocks (clock drift) on board the satellites can translate to large position errors; a clock error of 1 nanosecond translates to 1 foot or .3 meters user error on the ground. Multipath effects arise when signals transmitted from the satellites bounce off a reflective surface before getting to the receiver antenna. When this happens, the receiver gets the signal in straight line path as well as delayed path (multiple paths). The effect is similar to a ghost or double image on a TV set.

  • The base station, depending upon how it is configured, can correct roving GPS receiver data in one (or both) of two ways. 1) In the first method, called real-time differential correction or real-time differential GPS (DGPS), the base station transmits (usually via radio link) error correction messages to other GPS receivers in the local area. In this case, the positions you read on your GPS receiver while you are out collecting data, are the corrected positions. 2) The second method, called post-processed differential correction, is performed on a computer after the roving receiver data are collected. While you are out in the field collecting data, the positions you read on your roving GPS receiver are uncorrected. It is not until you take your rover files back to the office and process them using differential correction software and data from the base station file, that you get corrected positions. The base station file contains information about the timing errors. This information allows the differential correction software to apply error corrections to the roving receiver file during processing. Since the base and rover receivers have to "see" the same set of satellites at the same time, the base file has to start before the rover file starts, and end after the rover file ends (a base station is normally set up to track all satellites in view, insuring that it will "see" at least the four satellites that the roving receiver is using to compute positions). Post-processed differential correction, then, requires both base and rover receivers that are capable of collecting and storing files. Most recreational grade receivers cannot collect and store files that can be differentially corrected.

    You can set up your own local base station or share a base station with other GPS users in your area. If you are using post-processed differential correction, the base station can usually serve users in an area with about a 2 to 300 mile radius (the further the roving receiver is from the base station, the less accurate the corrections). If you are using real-time differential correction, you must establish radio links, and your coverage area is limited by the strength of the radio transmissions. If you plan to set up your own base station, make sure the manufacturer can supply all the necessary components including base and rover receivers, radios (if using real-time correction) and differential correction software (if using post-processed correction).

    Related Web Sites
    • Sam Wormley's Global Positioning System Resources - Sam Wormley's Web site provides numerous links to Web resources on Global Positioning Systems. His site includes an extensive bibliography of books on the subject of Global Positioning. This educational observatory site also helps K-12 students do real science via the Internet.
    • The Global Positioning System Overview - These materials were developed by Peter H. Dana, The Geographer's Craft Project, and the Department of Geography at the University of Colorado in Boulder. It provides an overview of global positioning systems, a reference list, and related links and documents.
    • U.S. Coast Guard Navigation Center Global Positioning System (GPS) - This Web site has general information about GPS. It includes the United States policy statement regarding GPS availability.
    • Geocaching (a GPS online game) - "A GPS device and a hunger for adventure are all you need for high tech treasure hunting. Here you can find the latest caches in your area, how to hide your own cache, and what you need to get started in this fun and exciting sport."

  • Book/Card Print * Maintaining control and accountability of passport books and passport cards * Reviewing application information and printed passport books

    Other uses of GPS include real estate valuation and taxation assessment, air quality studies, environmental protection, demographic analysis including marketing studies, atmospheric studies, oil and gas exploration, and scientific exploration. There are many additional current and possible uses for GPS. Any application where location information is needed is a possible candidate for GPS.

GPS Navigation & Accessories: Car Electronics - Best Buy

Those bereaved by suicide are also significantly at risk of dying by suicide and an important focus of government strategy to help reduce the suicide rate amongst this vulnerable population. Those who have lost love ones struggle to cope and often feel isolated, stigmatised and unsupported. The bereavement has a serious effect on their own mental health and as a result many people turn to their GPs in the first instance.