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consumer report gps handheldThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
GPS allows the military to accurately target its missile arsenal, largely composed of cruise missiles and precision-guided munitions. This was born out by the use of SOFLAM (Special Operations Forces Laser Acquisition Markers) targeting during the attacks on Tora Bora in Afghanistan. It also improves the accuracy of the US submarine launched ballistic missiles by providing precise locational information to the submarine commanders. Finally, command and control over troops is improved because commanders know precisely where their troops and the enemy are located on the battlefield. GPS receivers come in a variety of consumer formats, and today can be found in cars, watches, phones boats and planes. Major manufacturers include Trimble, Garmin and Leica, low-end, hand-held consumer units are often available at less than $100 per unit. The first experimental Block-I GPS satellite was launched in February 1978. The GPS satellites were initially manufactured by Rockwell International and now manufactured by Lockheed Martin. In 1998, Vice President Al Gore announced plans to upgrade GPS with two new civilian signals for enhanced user accuracy and reliability, particularly with respect to aviation safety. GPS derives in part from its predecssor, the LORAN navigation system. LORAN was designed for ship and airplane navigation in the 1940s for use during World War II. Because GPS is as much an accurate time keeper as a locator, one of the most common applications for GPS units is as a reference clock for time code generators or NTP clocks. For instance, when monitoring earthquakes, each seismic sensor can be synched with the GPS system to provide a synchronized, precise time source for measurements. The United States Department of Defense developed the system, officially named NAVSTAR GPS (Navigation Signal Timing and Ranging GPS), and the satellites are managed by the 50th Space Wing at Schriever Air Force Base. Although the cost of maintaining the system is significant, GPS is available for free use in civilian and commercial applications. GPS receivers calculate their current position (latitude, longitude, elevation), and the precise time, using the process of trilateration after measuring the distance to at least four satellites by comparing the satellites' coded time signal transmissions. In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994. Commercial civilian GPS receivers are purposefully less accurate than they might be. In specific, they are required to have limits on the velocities and altitudes at which they will report coordinates in order to prevent them from being used to create improvised missiles. Selective Availablity typically added signal errors of up to about 10 m horizontally and 30 m vertically. The inaccuracy of the civilian signal was deliberately encoded so as not to change very quickly, for instance the entire eastern US area might read 30 m off, but 30 m off everywhere and in the same direction. In order to improve the usefulness of GPS for civilian navigation, Differential GPS was used by many civilian GPS receivers to greatly improve accuracy.
1. GPS brands from Consumer Reports
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Consumer Reports (consumerreports.org) takes a new look at it's reviews on handheld GPS ... 11. GPS Reviews - Best Handheld GPS - Garmin Handheld GPS ... We offer information and reviews on the best handheld gps units from Garmin, Magellan, and Lowrance ... Consumer Reports ranked the "best handheld GPS navigators" based on ... 12. GPS World Handheld OEM: news, information, and trends for ... ... news, features, opinion pieces, and product information for manufacturers of handheld consumer GPS and GNSS units and personal navigation devices. ... 13. Consumer Reports Cars Blog_ 2010 CES_ New Delorme PN-60w ... 2010 CES: New Delorme PN-60w handheld hiking GPS is Spot on ... Consumer Reports Cars Blog: 2010 CES: New Delorme PN-60w handheld hiking GPS is Spot on ... 14. Garmin GPSMap 76S Handheld GPS review by rocketboy52 ... Garmin GPSMap 76S Handheld GPS review by rocketboy52, consumer reports & videos 15. Garmin eTrex Handheld GPS Navigator reviews, consumer reports ... 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Compare prices and narrow the selection to items that have Handheld at mySimon. ... Consumer Reports - Portable GPS Navigation ... 29. Best GPS Reviews 2009-2010 | Ratings & Recommendations | Top ... Best GPS Consumer Product Reviews 2009-2010 | Ratings & Recommendations | If it has fewer than 4 stars, you won't find it here. 30. CTV Calgary- Tracking down the best handheld GPS - CTV News Consumer Reports tested a number of different handheld devices to find out which one worked the best. ... Handheld GPS units are hitting the market and they can be a great ... 31. New GPS units made specifically for hikers - CTV News Could new handheld GPS units made just for hiking keep you from getting lost? Consumer Reports headed into the woods to test them out. 32. In-Stat - Handheld GPS Devices Gaining Traction With China's ... Handheld GPS Devices Gaining Traction With China's Consumers ... A recent report by the high-tech market research firm found the following: Portable ... 33. Choosing the best handheld hiking GPS for holidays | Consumer Consumer Reports >> Consumer Reports Choosing the best handheld hiking GPS for holidays Handheld hiking GPS devices combine technology treasure hunting ... 34. Germany Maps GPS Devices Product Reviews and Prices ... Epinions.com - Find Germany Maps GPS Devices by Brand: TomTom, Garmin, Navigon, Magellan, ASUS, Medion, Mio, Acer, Typhoon, Hewlett Packard. 35. Hand-held GPS - consumer.org.nz So a handheld GPS unit is essential for the navigationally challenged although some are better than others, as our test results show. Highlights of this report ... 36. Consumer Reports Best GPS - Video Informative video about Consumer Reports Best GPS ratings.. Watch Video about Consumer,Reports,Best by Metacafe.com } ?>
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