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GPS receivers get latitude and longitude position information, and time, from a constellation of 24 satellites orbiting 11,500 miles above the planet. How it derives a latitude and longitude from those satellites is near magical and beyond the scope of this answer. For a GPS receiver to provide street location it has to have a database of street level maps converted to latitude and longitude. The database is usually stored in internal flash memory or, in some cases, on a flash memory card. The two biggest map providers for GPS manufacturers are Navteq and TeleAtlas. The Navteq maps are reputed to cover North America better and are used in the Garmin units. The TeleAtlas maps are considered more accurate for Europe and are used by the Dutch company that makes the TomTom units. Most GPS units can have their map database updated or replaced entirely.

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How does a satelliet navigation system differ than a GPS system?

They do not differ. A GPS system uses 3 different satellites that communicate together with your GPS to for a 3 dimentional que point to where you are in a 3 dimentional plane. (Thats why they need three) X,Y, and Z coordinates. There is a precomputed couple second 1-8 delay for all of the information to travel because they have already understood that it takes time for the information to get you. A satellite navigation system is another way of saying GPS.


What kind of satellites are used for Global Positioning Systems?

GPS uses satellites that were placed into orbit by the Department of Defense. The government set up the entire network on their own, and it is free to use as long as you already have a GPS device.


Should there be a limit placed on the number of satellites that are allowed to orbit the earth?

Some experts argue that there should be a limit on the number of satellites to prevent overcrowding and the creation of orbital debris that hinders future space activities. Others believe that strict guidelines and regulations on satellite launches are sufficient to manage the space environment without a specific limit on the number of satellites.


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The lunar eclipse is visible from different parts of the world. For specific timing and visibility in your location, it's recommended to check local astronomical societies or websites for accurate information.


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A severe weather warning is typically issued to alert the public of dangerous weather conditions that are imminent or already occurring, posing a threat to life and property. It provides important information about the type of severe weather expected, its location, and anticipated impacts, helping people take necessary precautions to stay safe.

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How does a satelliet navigation system differ than a GPS system?

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