Posts Tagged ‘Gps Receivers’

GPS Reviews Comparison – How to Choose the Right Model

March 23rd, 2010



If you’re like me, choosing the right GPS receiver is a little daunting. What helps is a good GPS reviews comparison, where you can learn what various models do and how much they cost. In other words, you need a guide!

Choosing the right GPS device is critical. Prices have dropped over the past two years, and you can probably get a model with more bells and whistles than you think you can. To help you form your game plan, let’s first talk about who the main manufacturers are, then what various models do and how much they cost.

There are a number of companies that make GPS receivers, but the big three are Garmin, Tom Tom, and Magellan. Garmin is the industry leader with by far the most market share, and also a much broader range of products than anyone else.

Magellan actually was one of the first companies to make these nifty little devices. They were essentially the pioneer. And Tom Tom is the new arrival. Although new, Tom Tom has made great inroads on the market shares of the more established companies by offering great products at great prices.

Any good GPS reviews comparison should tell you what you can expect to buy. So, let’s run over the basic features that you’ll get with any GPS receiver.

All GPS receivers have a touch screen interface, maps of the lower 48 states, and a database of Points of Interest (POIs). All receivers also calculate the best route from where you are to where you want to go, and they give you directions via spoken voice prompts.

The base models of either Garmin, Tom Tom, or Magellan will do all of this and more.

For around $150 you can get the Garmin nuvi 200, the Tom Tom One, or the Magellan Maestro 3100. These three models all cover the basic features I mentioned.

What if you want more? How much is that going to cost?

Well, let’s run over what more you can get.

Upgrades are: more maps (Alaska, Hawaii, Canada, Europe, Mexico), bigger screen, Bluetooth, real-time traffic and weather, many more POIs (how about 6 million!), and multiple routing.

You can get most of this stuff for $350! For instance, the Garmin 660 can do all of the above except the multi-route calculations. It sells for slightly under $350.

Magellan’s Maestro 4250 is a direct competitor and can do essentially what the Garmin 660 can. The 4250 is currently selling for slightly more than $250.

Tom Tom’s comparable receiver would be the Tom Tom Go 720, which is currently selling for less than $350.

Of course, you might be willing to spend more!

As you go higher in price, each of these companies offers great proprietary features. Magellan has a deal with AAA, for instance, to include their Tour Book right in the device. (For AAA members only.)

A good GPS reviews comparison can only do so much, however.

Now you need to actually get on an informative website and start browsing.

By: Lee Cole

How GPS Receivers Work

March 21st, 2010



It seems that almost everyone has heard of GPS (Global Positioning System) in one form or another. The most well known GPS device is the car navigation system that shows and tells the driver through voice commands how to get to their desired pre-programmed destination. But if you’re wondering how these little technological wonders work then you’ve come to the right place.

A GPS receiver is an electronic device that uses the Global Positioning System to determine its exact location on earth with pin-point accuracy. This system is made up of the three parts; 27 satellites that send out continuous positioning signals, ground stations around the world that help synchronize the satellites, and various types of GPS receivers.

In this article we’re going to concentrate on how a GPS receiver works within this system since it’s the piece of the GPS puzzle that keeps you from getting lost. Its main function is to calculate its position on the earth using the signals that it receives from the satellite system.

To do this the receiver needs to lock onto the signals of at least 3 satellites. Once 3 or more satellites have been detected it then needs to determine the distance between the satellites and the distance between itself and each satellite. It then uses the basic math principles of triangulation or trilateration to compute its location on the earth’s surface.

The signals a GPS receiver uses to figure its location are radio signals transmitted by the satellites. These radio signals have three bits of information embedded in them; ephemeris data, almanac data, and a pseudorandom code. Using this information the GPS unit is able to triangulate its position and report that back to its user.

Accuracy is another question many first time users wonder about. The good news is GPS receivers are very accurate with the ability to pin-point your location to within a radius of 20 meters. There are ways to increase accuracy through the use of DGPS (Differential GPS) and WAAS (Wide Are Augmentation System) which can get within 3 meters of accuracy. Units with these two features normally cost more but the increase in accuracy can be well worth the cost.

There are many factors that can and do affect how accurately a GPS unit reports its position. These include:

1. The number of visible satellites
2. Signal delays caused as they pass through the earths atmosphere
3. Signals bouncing off of objects
4. Inaccurate clock in the GPS unit
5. Ephemeris errors
6. Satellites in poor positions
7. Satellite signals that are blocked because of terrain or manmade features

GPS is a great technology that has found its way into many everyday applications. Depending on your needs for keeping track of where you are there is sure to be a GPS receiver that fits the bill.

By: Andrew Bicknell

Utilizing GPS Technology

February 17th, 2010



Automotive GPS Systems

Originally conceived and developed by the United States Department of Defense for use in military applications, GPS tracking technology has in recent years been opened up to commercial development and use by the general public. As a result of this, GPS tracking has seen a huge rise in popularity as more and more ways to utilize the technology has emerged in the marketplace. GPS capability can now be found in newer cars or as an aftermarket accessory for older cars as a replacement for having to deal with paper maps, as a handheld personal device for campers, hunters and other outdoor users, in some newer cell phones as a tracking device, and there are even GPS treasurehunting groups who hide objects and then post clues on the internet, for users to try and find using GPS systems. GPS systems are also finding great use by companies for tracking movement of vehicles and personnel as a way of monitoring business costs. And they are also being used by individuals as a way of monitoring personal vehicles of all kinds against theft and to monitor younger drivers whereabouts and driving habits.

A GPS system is basically an electronic transmitter/receiver that is in communication with a series of 24 satellites which orbit above the earth, and through communication with the satellites can pinpoint where on earth that receiver is. In the case of automobile navigation units, the user programs in a destination to the receiver and the satellites determine where the receiver actually is and then the receiver, using map data programmed into it can map the most direct route to get to the destination entered into it and display that information on a view screen. The information is constantly updated through communication between the receiver and the orbiting satellite system. Probably the most productive uses of GPS receivers would be as tracking and monitoring devices to monitor movement of vehicles for theft protection of vehicles and for commercial fleet management as well as keeping track of where young drivers go and what their driving habits are.

As with most electronic items, mass production is bringing the price down to the point where it is affordable to most everyone who is interested in GPS tracking. Basic units can be found for as little as a couple of hundred dollars, while more complex systems can run as much as a thousand dollars depending on what features and capabilities an individual has need of. Some GPS tracking systems may require an additional monthly monitoring fee similar to monthly cell phone charges.

By: Paul Dyer