Posts Tagged ‘Gps Receivers’

How to Choose the Right Bluetooth GPS Receiver

February 9th, 2010



When the first Bluetooth GPS receiver came out, honestly I thought that was something I didn’t need. Actually, I’m not one of those drivers who spends a lot of time talking on the phone. Later when I upgraded my GPS to a unit that had Bluetooth, I loved being able to talk “hands-free” so much I would never consider buying a unit without that capability.

Buying a GPS is sometimes difficult because there are so many manufacturers and they have so many products to choose from. If you’re focusing on a GPS that has Bluetooth, then you’re narrowing the field down some, but still, you have a ton of possibilities.

In this article I’m going to make the choice of the right Bluetooth GPS a little (how about a lot?) easier for you. Once you finish reading this, you’ll be ready to purchase the right unit for your needs and your budget.

One thing that helped me when I bought my unit was realizing there are three main manufacturers of GPS devices. Garmin is the industry leader with probably 70% of the market share. Tom Tom is fast catching up with great products and great prices. And Magellan certainly holds its own as one of the early pioneers with a lot of proprietary features.

I’m not going to tell you which unit I chose. I will tell you it was made by one of these three.

Let’s talk about each of these companies and their GPS’s that have Bluetooth capability.

Garmin

Garmin has a huge range of products. They have several GPS devices that have Bluetooth integration. Personally, I like their newer, sleeker nuvi line. The nuvis are replacing the StreetPilot as Garmin’s flagship line of GPS receivers.

There are several nuvis with Bluetooth. Their numbers are the 360, 370, 660, 670, 680, 760, 770, 780, and the recent arrivals the 880 and the 5000.

The 300s all have the smaller 3.5-inch screens. The main difference between the 300s and the 600s is the screen size. If you want a huge screen, try the 5000! It’s screen is a huge 5.2-inches along the diagonal.

The 600s also have what’s called FM transmission capability. That is, the sound from the GPS is routed through your car’s stereo system.

What the 700s offer above the 300s and the 600s is multi-destination routing. In other words, if you want to drive from New York to Calgary to Vancouver to San Francisco, you can enter all that information in your GPS at one time and it will calculate the best route to get you to all three places. (Unfortunately, it can’t make the drive shorter!)

Nuvis currently run from right around $200 for the 300s to $350 or so for the 700s. The 5000 is currently around $650, and the 880 runs about $1,000.

Magellan

I absolutely adore Magellan’s Maestro line! In that line, there are two GPS’s that support Bluetooth, the 3250 and the 4250. They are the same, except the 4250 has the larger 4.3-inch screen.

These devices are comparable to the Garmin nuvis. Magellan does have a proprietary thing with AAA, where they offer their Tour Book actually on the device. (You have to be a AAA member to access it.)

At the moment, the 3250 will set you back about $200. Believe me, that’s a lot of GPS for that amount of money. And the 4250 is about $250.

Tom Tom

Tom Tom is the newer kid on the block. And they have been aggressively gaining market share with great products and very aggressive pricing. The Tom Tom Go line supports Bluetooth. The Go 510 runs slightly less than $200 and the Go 920 runs between $300 and $350.

Unfortunately, no six hundred word article can tell you all you need to know about these great devices, even if you narrow it down to just the ones with Bluetooth. What you need to do now, is to get on an informative website where you can actually look at specific models and check their current prices.

By: Rick Cole

GPS – Basic Definition

January 29th, 2010



GPS (Global Positioning Systems) have been around for quite some time now. Its first use was with the military, but they have more recently been associated with civilian navigation devices. The latter is the topic of this discussion.

There are three components necessary for the success of a Global Positioning System. Those components are made up of 24 satellites, GPS Receivers, and ground stations. Each component must work in harmony or there will be inaccurate readings. A brief description of each and their functionality follows.

GPS Receivers act just as their name indicates. They receive information from the chosen satellites using radio waves to calculate their exact location. Once this information has been received, feedback is provided to the user. Ground stations have a two-fold operation. The first is to ensure the health of the satellite. The second is to respond to the satellite with its exact location. This location is very important as it is used to later determine the exact coordinates of a GPS device. Satellites determine the coordinates of a GPS device using trilateration. Basically, three satellites use radio signals to determine the total distance from the GPS [http://www.happyjaysgps.com] device. This can become very complicated because of a variety of interference possibilities. Therefore, most civilian GPS systems use additional satellites to increase accuracy.

GPS systems continue to grow in popularity. There is a belief they will one day be as common as the telephone or television. There is also a belief that the high popularity will help to push builders into furthering the technology with improvements much in the same way as the cellular phone in recent years.

By: James D. Allen

How Accurate is GPS?

January 27th, 2010



The answer to this question keeps changing along with advancing technology as well as United States law.  The first consumer GPS receivers on the market were far less accurate than the receivers available today even though the satellites are the same.  Also, before the year 2000, the military intentionally introduced inaccuracies into the civilian GPS signal for “security” reasons.  They called this intentional signal error “Selective Availability”.  In May of 2000, President Clinton made a decision to turn off SA and allow civilians access to increasingly accurate GPS signals.  The military still has the ability to turn off or introduce errors into GPS signals at any time and with no notice but this ability is generally only used for specific reasons of national security.

The best consumer GPS technology available as of 2007 achieves an accuracy level of 15 to 30 feet under normal conditions.  Garmin, currently the most popular manufacturer of GPS receivers, claims their GPS units are accurate to within 50 feet 95% of the time.  Even within the Garmin GPS receiver line, accuracy specs differ because of the different chips used in the design of different receivers.

GPS Receiver Design Affects GPS Accuracy

If you are looking for the most accurate consumer GPS unit, it’s important to pay attention to the unit’s chip type.  The latest technology in GPS receiver chips is the SiRFStar III from SiRF.  With this chip in your receiver and WAAS enabled you can expect to reach the best GPS accuracy levels available under current conditions.

Environmental Factors Affect GPS Accuracy

Many different environmental factors can also affect the accuracy of your GPS receiver.  Heavy tree cover, tall buildings, deep canyons, and any location in which your view of the sky is limited can affect how accurate your GPS is.  Atmospheric conditions can also degrade the accuracy of your GPS unit. 

As you can see, there is no easy answer to the question “how accurate is GPS?”.  However, you now know the main factors that can affect GPS accuracy.

By: Markus Hamilton