Posted by admin | Posted in Boat Chandlers | Posted on 24-11-2006
Tags: best garmin gps running watch, garmin, garmin gps running reviews, garmin gps running watch, garmin gps running watch review, garmin gps running watches, gps, maps, running, software
GPS, or Global Positioning System, is the last thing to keep from getting lost on a hike to visit your Aunt Louise. Years ago, there should be on benchmarks, practice your compass or the guy at the gas station next door, assuming he knew where everything was. Today, for about a hundred dollars you can get a little gadget that tells you exactly where you are, anywhere on Earth. Using basic mathematical calculations and a system fairly complex, you can be in the middle of the desert, may be lost, push a button and your GPS tell you exactly where you are so you can expect find your way back home.
What exactly is GPS and how does it work?
The GPS is actually very complex and expensive system but the basic concepts of the system are very simple.
The GPS system is a group of 27 satellites orbiting the Earth. Twenty-four of them are operational and 3 are backups in case one fails. The system was originally created for the U.S. Army but was finally open to everyone.
Each of these satellites, weighing about 4,000 pounds, circles Earth at about 12,000 miles per hour and is 2 trips a day. The orbits are arranged so that at any point in the day, 4 of these satellites are visible from anywhere on Earth.
Complimenting the receiver was set to receive signals from these satellites has the task of locating 4 or more of these satellites, know the distance to each and from that information determine where on the planet the receiver itself is located. It then transmits that location to the person is in possession of the receiver. The operation is based on a simple mathematical principal called trilateration. To explain just how it works, let's say someone tells you that you are 10 miles from Newark, NJ, another person tells you that you are 15 miles from Maplewood, NJ and a third person tells you that you are 20 miles from Woodbridge, NJ. Taking these three facts that you can calculate exactly where you are, because each radius of each distance when linked together intersect at one point. This is where you are.
In order to effectively computing space GPS receiver needs to know 2 things. The location of at least 3 satellites above you and the distance between you and each of these satellites. Why only 3 satellites or spheres are needed because the Earth itself can act as a fourth sphere. The GPS receiver itself operates by radio waves which are a kind of electromagnetic energy and travel at the speed of light receiver can really know how far the signal has traveled by timing how long it took to get the signal from each satellite.
In the next article on GPS, we go over exactly how this system works to measure the distance.
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Michael Russell
Your Independent guide to Global Positioning Systems
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GARMIN FORERUNNER 205/305 $29.95 “Forerunner 305, Garmin Training Center CD-ROM, heart rate monitor, docking cradle, expander strap, A/C charger, USB cable, owner’s manual, quick start guide. “… |
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Garmin Getting the Most From Your GPS: Forerunner 405, 405CX $29.95 Learn all the features & functions & HOW TO USE & MAXIMIZE your Garmin unit. This step-by-step instructional training DVD walks you through the key features and functions of the Garmin unit from the basics to advanced operation.This product is manufactured on demand using DVD-R recordable media. Amazon.com’s standard return policy will apply…. |
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Garmin Getting the Most From Your GPS: Forerunner 305, 310XT $29.95 Learn all the features & functions & HOW TO USE & MAXIMIZE your Garmin unit. This step-by-step instructional training DVD walks you through the key features and functions of the Garmin unit from the basics to advanced operation.This product is manufactured on demand using DVD-R recordable media. Amazon.com’s standard return policy will apply…. |
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Garmin Forerunner 405 Wireless GPS-Enabled Sports Watch $299.00 Fire your personal trainer and strap on the Garmin Forerunner 405 GPS Watch. This easy-to-use training tool uses GPS satellites for full monitoring and analysis of your workouts, as well as the ability to download wirelessly to your computer. The 405 continuously monitors your time, distance, pace and calories, and stores each of your workouts so you can track your improvement. The GPS functions a… |
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FR60 Watch with Heart Rate Monitor and USB ANT – Women’s Lilac 000 by Garmin $124.99 115139LIL000 Features: Log every mile and every minute with this workout tool that tracks your time, distance, cadence and calories to indoors or out to and connects wirelessly to a lightweight, flexible digital heart rate monitor to provide instant feedback and to an optional Foot Pod for pace and distance analysis Stay aware of your levels with training alarms, and push yourself when necessary w… |
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Garmin GSC 10 Speed/Cadence Bike Sensor $31.95 Monitor your pedaling cadence as you ride with this self-calibrating, wireless speed/cadence sensor. It measures and reports your pedaling strokes per minute, providing feedback for optimal performance. Part Number: 010-10644-00… |
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Garmin Forerunner Quick Release Kit $12.45 GARMIN 010-10889-00 Forerunner 305/205 Quick Release Kit Forerunner 305/205 Quick Release Kit Ideal for Athletes Who Perform Multi Sport Training Forerunner 205 or Forerunner 305 Can Go From Wrist to Bike In Seconds Compatible with Forerunner 205 and 305 Contains a Wrist Strap with an Attached Mounting Bracket Includes Wrist Strap with Quick Release Bracket and Bike Mount Cable Ties, Spring … |
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Garmin Forerunner 305 GPS Receiver With Heart Rate Monitor $299.99 Package Includes: Forerunner 305, Heart rate monitor, docking cradle, expander strap, AC charger, PC/USB interface cable, Quick start guide, Garmin Training Center CD & owner’s manual The Garmin Forerunner 305 GPS System combines form and function. This combination running partner and personal trainer is designed for athletes of all levels. It features a high-sensitivity GPS receiver, new cours… |