| Global Positioning System (GPS) is a
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| | same route. They can add points of
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| navigational aid originally developed for
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| | interest such as water sources, possible
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| the military. The system simply receives
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| | campsites, and other items of interest on
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| signals. It is the applied technology
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| | their trail. However, the portability
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| that gives the GPS its versatility.
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| | demanded by hikers will also limit the
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| If you have ever used map and compass,
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| | functionality of the system as small
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| you will understand a little about how
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| | screens mean that some detail will be
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| the GPS works. In order to find your
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| | lost.
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| position on a map, you need to have three
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| | It is GPS technology that is used to
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| points of reference. The intersecting
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| | track individuals on home arrest, to
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| line from the reference points is where
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| | trace missing pets, stolen vehicles, and
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| you are. Map and compass work uses
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| | missing people. Small systems can be
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| triangulation (bearings), GPS uses
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| | incorporated into pet collars and
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| trilateration (distances) to calculate
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| | wristwatches. As long as the receiver is
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| location. Satellites orbiting the earth
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| | active, it can be found.
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| emit unique signals that can be received
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| | Marine and aviation GPS units are
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| by a GPS. The GPS software interprets the
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| | sophisticated and specialized. The
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| signal, identifying the satellite that it
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| | principles involved are the same as any
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| came from, where it was located, and the
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| | standard system the software is much more
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| time that it took for the signal to reach
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| | highly developed.
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| the system. Once the receiver has both
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| | Any fisherman, who is using a fish finder
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| time and distance it begins to determine
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| | on his boat, is using a GPS that is
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| position.
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| | enhanced by sonar and tracking devices.
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| Three satellites provide the intersection
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| | Units have been developed for use on
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| point and the fourth is used to check
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| | float tubes also -- as GPS technology
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| that the positioning is accurate.
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| | advances, the systems become more and
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| Accuracy depends upon the synchronization
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| | more compact and their uses more and
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| of atomic clocks in the satellites with
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| | more extensive.
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| the clock in the GPS system. Although the
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| | If you are considering purchasing a GPS,
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| clock in the GPS is not atomic,
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| | make sure that it can be updated easily.
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| utilizing the fourth satellite gives it
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| | This is especially true if you buy a
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| that functionality as the internal clock
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| | multi--function GPS or one that is used
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| adjusts itself to correct any discrepancy
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| | where conditions change regularly. An
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| discovered.
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| | in--vehicle GPS soon loses its usefulness
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| GPS has gone far beyond its initial
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| | if it is not updated as road systems
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| military application. Drivers can find
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| | change.
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| their way through city streets, long
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| | Updates vary according to the device
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| distance trekkers use the technology to
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| | being used. They can come in CD/DVD
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| cross unfamiliar terrain, mariners and
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| | packages or as computer downloads. The
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| pilots use GPS enhanced data to cross the
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| | user can purchase maps specific to the
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| seas and skies.
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| | area in which the GPS will be used or a
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| In--vehicle GPS can be integrated into
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| | range of maps and routes. These are
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| the car entertainment system or can be
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| | available from GPS software companies
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| installed as a removable device. These
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| | who will charge proportionally to the
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| systems need to tell the driver where he
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| | sophistication of the software.
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| she is and how to reach their
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| | GPS units vary in price according to
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| destination. The information includes
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| | their usefulness. It is possible to buy
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| road directions plus relevant features
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| | units for less than one hundred dollars
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| along the way such as rest stops, gas
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| | to units costing more than one thousand
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| stations, points of interest, etc. Auto
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| | dollars. What your needs are will be a
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| GPS uses voice commands so that the
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| | factor in the cost of your unit. If you
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| driver can concentrate on the road.
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| | are a backpacker then portability is a
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| Hikers and trekkers use similar
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| | major consideration. If you are a
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| technology, but normally without the
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| | trucker, you need to be able to find a
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| inclusion of road systems on their
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| | delivery point as quickly and
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| devices. Mapping software defines the
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| | conveniently as possible. Whatever device
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| territory that the hiker will encounter.
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| | you go for, cost is generally related to
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| The user can enter waypoints (points of
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| | quality. Buy the best you can afford.
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| reference) so they can return using the
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