If you're accepting problems with advice displayed by your car aeronautics arrangement or handheld claimed aeronautics accessory -- amiss addresses, missing area names, bankrupt artery exits, etc. -- it's acceptable you're experiencing a mappingcomputer application issue, not a botheration with the Global Positioning Arrangement (GPS).
GPS Helps You Get Your Coordinates
GPS satellites are abundant simpler than best bodies think. They cannot clue you. They don't accept absolute map databases like Google Earth. In fact, they accept no ability of annihilation on the ground.
GPS satellites are aloof beacons, like lighthouses, that acquaint you area they are in space. They do not acquaint you area you are. Your aeronautics accessory uses the satellites as advertence credibility to actuate your coordinates on the Earth in agreement of latitude, longitude, and altitude.
Of course, raw coordinates are abortive after a map. The ancient GPS receivers did not accept congenital maps, so users had to artifice their coordinates on cardboard maps to navigate. Alone in contempo years has the technology existed to accommodate agenda mapping appearance in affordable aeronautics devices. Alike today, abounding GPS units don't arise with maps -- for example, tracking accessories acclimated on prisoners and animals.
Who Provides the Maps?
The maps and added advice about roads, addresses, businesses, etc., are loaded assimilate customer aeronautics accessories by the bartering companies that accomplish them. The U.S. government's GPS affairs does not accommodate any of this data.
Most manufacturers get their agenda maps and abstracts from bartering map makers (or agenda agreeable suppliers), the better actuality NavTeq and Tele Atlas. Some accessory manufacturers advance their own maps.
In accession to maps, abounding aeronautics accessories action appearance such as avenue suggestions, cartage alerts, and articulation announcements of turns and artery names. These account are provided by the accessory manufacturers and accept annihilation to do with the GPS satellites.
Why Are My Maps/Routes Incorrect?
If your aeronautics accessory says you are active off-road back you aren't, it's accessible your GPS coordinates are correct, but your accessory is cartoon the alley incorrectly.
Some advice in your aeronautics accessory may be based on earlier maps able afore the era of GPS precision. Also, maps crave connected updates to break accurate. Anchorage consistently change due to construction, acting detours, etc. Fresh apartment developments and business parks arise every week. And restaurants and food are consistently opening, closing, relocating, or alteration names.
Even a cast fresh agent with an installed aeronautics arrangement could accept anachronous map advice if, for example, it sat at the dealership for a few months afore you bought it. If you do not install the most recent maps or subscribe to an amend service, your aeronautics arrangement will abatement alike added abaft the times.
Another account of map errors is thecomputer application that approximates the area of artery addresses. For example, say you alive at 150 Main Street, abutting to a ample acreage that occupies two-thirds of the block. Lacking a plot-by-plot map of your neighborhood, a aeronautics accessory may accept your home is center up the block, arch commitment trucks to the amiss location.
Devices accouterment avenue abetment charge both their maps andcomputer application to be up to date, or they may accomplish bad suggestions, such as demography a clay alley through someone's clandestine property.
In any case, homes and businesses are appropriate to accept their addresses acutely arresting from the street. More importantly, drivers are still amenable for celebratory acquaint alley signs and application accepted sense.
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