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Archive for the ‘GPS’ Category

The Global positioning System (GPS) is often used by computer equipment, such as NTP Server systems, to provide an accurate timing reference for time critical applications. This article provides an overview of GPS for timing applications and describes the equipment used to install a GPS antenna in a static location.

Overview – Using GPS for Accurate Time

The Global Positioning System is a US military system for worldwide navigation. The system consists of 24 orbiting satellites, each satellite has a highly accurate atomic clock on-board synchronised to UTC time. The satellites continuously broadcast time and position information. The time and position information can be obtained worldwide with a GPS receiver and antenna. GPS works continuously in any whether conditions, anywhere in the world. Additionally, there is no set up fee or subscription charges to utilise the GPS systems. Many computer timing systems and NTP Server systems utilise GPS as an accurate external timing reference.

The Accuracy of GPS Timing Systems

GPS receivers provide highly accurate position and timing information. Typically, a GPS receiver can provide positioning information to an accuracy of 15m. NTP Server systems can obtain timing information from GPS to a resolution of a few nanoseconds.

The GPS Signal

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Garmin nüvi 50 5-Inch Portable GPS Navigator(US and Canada)

Features:

• Lane assist with junction view
• Speed limit indicator
• Trip computer records mileage, max speed, total time and more.
• Navigate right out of the box with preloaded maps and over 6 million points of interest
• Hear spoken street names

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Garmin nüvi 50 5-Inch Portable GPS Navigator(US and Canada) Description
nüvi 50 delivers you safely wherever life takes you. Designed to make navigation easy, simply enter an address and premium features including lane assist with junction view, help you make all the right turns!

With a big 5” (12.7 cm) touchscreen, more than 8 million points of interest (POIs) and spoken turn-by-turn directions, nüvi 50 makes driving fun again.

Get Turn-by-Turn Directions nüvi 50′s intuitive interface greets you with two simple choices: “Where To?” and “View Map.” Touch the screen to easily look up addresses and services and to be guided to your destination with voice-prompted, turn-by-turn directions that speak street names. It comes preloaded with maps for the 49 States and Canada. nüvi 50’s speed limit indicator shows you how fast you can go on most major roads. With its “Where Am I?” emergency locator, you always know your location. It also comes preloaded with millions of POIs and offers the ability to add your own. Know the
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This is The Best Selling Garmin nüvi 50 5-Inch Portable GPS Navigator(US and Canada) tends to SELL OUT VERY FAST!!.

Garmin nüvi 2455LT 4.3-Inch Portable GPS Navigator with Lifetime Traffic Updates

Features:

• Over 8 million points of interest and see branded icons on the map as you navigate.
• Lane assist with photoReal junction views.
• Park position recall – find your car where you left it.
• Speed limit indicator – unit displays speed limits for most major roads.
• Lifetime traffic updates

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Garmin nüvi 2455LT 4.3-Inch Portable GPS Navigator with Lifetime Traffic Updates Description
Whether you’re driving through an unfamiliar city or on your daily commute, nüvi 2455LT makes your trip easier than ever before. It includes FREE lifetime traffic updates¹, advanced lane guidance and more.
Get Turn-by-Turn Directions Garmin Guidance 2.0′s intuitive interface greets you with two simple choices: “Where To?” and “View Map.” Touch the screen to easily look up addresses and services and to be guided to your destination with voice-prompted, turn-by-turn directions that speak street names. It comes preloaded with maps for North America. It also includes more than 8 million points of interest and offers the ability to add your own. Avoid Traffic Tie-ups With FREE lifetime traffic updates from 3D Traffic, our most extensive traffic avoidance system, nüvi 2455LT can help you avoid delays. We check traffic conditions more than 2 billion times each month, so you can easily reroute around congestion and arrive on time. Know the Lane Before It’s Too Late
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This is The Best Selling Garmin nüvi 2455LT 4.3-Inch Portable GPS Navigator with Lifetime Traffic Updates tends to SELL OUT VERY FAST!!.

Map Capabilities

Most GPS models come with internal map capabilities. Manufacturer provides maps with details up to street level in the hard drive. The menu option enables you to access the desired data. Comprehensive street level maps can help you identify the coordinates of the destination on the map by using just the name, or locate the destination on map by giving the coordinates. For some models you will have to subscribe to a plan to update the maps on an annual basis. Check out some models with internal map capabilities at: http://www.reviewgist.com/gps-devices-reviews?mapCapabilities=Internal

Some models provide map information in memory cards having detailed information of a particular region. Thus you will need extra cards if you have to store information for more coverage. Map cartridges are more flexible but can prove to be expensive. Check the few models at: http://www.reviewgist.com/gps-devices-reviews?mapCapabilities=Map+cartridges+%2F+Data+cards

Models which enable one to download the latest maps are also available. Check such models at:

http://www.reviewgist.com/gps-devices-reviews?mapCapabilities=Download+maps

Some brands provide map information in CD-ROM, DVD-ROM discs. Check out one such model at: http://www.reviewgist.com/gps-devices-reviews?mapCapabilities=DVD

Receiver type

There are 24 GPS satellites in six orbits around the earth. GPS receivers track these satellites to compute the information of your location, the bearing, distance and time left to reach destination and other route options. Since there are 12 satellites at a time in view, each of them is tracked continuously to generate the information. Latest GPS receivers marketed today are commonly 12 parallel channel receivers. You can find some such models at: http://www.reviewgist.com/gps-devices-reviews?receiverType=Parallel-Channel+%2812%29
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Garmin Universal 5-Inch Carrying Case

Features:

• Fits most GPS navigators with a 5-inch display.

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Garmin Universal 5-Inch Carrying Case Description
Carrying Case fits all 5IN GPS-Navigators
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This is The Best Selling Garmin Universal 5-Inch Carrying Case tends to SELL OUT VERY FAST!!.