More information on gps devices

Choosing The Best PDA GPS For Your Needs

By Lorriane Weston

Personal Digital Assistants or PDAs are truly useful devices, they are hand held devices which remind you of appointments, store your business and personal records and can even double as a phone. By putting a GPS system on your PDA it can even give you direction and location information.

Just How Accurate Do You Have To Be?

Before investing in a GPS system for your PDA, ask how accurately it should operate. All units use data from the GPS satellite network, but the accuracy of the information relies on the PDA clock hardware.

The satellites are fitted with expensive atomic clocks which have great precision. PDA GPS units have less accurate clocks. Unless you have to know your position with detailed accuracy, say around 12 inches, you can choose a PDA GPS unit with the less expensive time piece and still find it extremely useful.

The GPS device transmits signals to the GPS satellite network, transmitting a timestamp, and the available satellites compare that with the timestamp from the signal which was previously received. The satellite then figures in how long it took to receive the signal, comparing this time calculation and the relative location of the other satellites. This is how it triangulates your earth based position. Information from a minimum of three satellites is required to collate all of the information required to advise your location. Another satellite adds enough accuracy to calculate altitude.

How Will You Use Your GPS?

Decide how you need to use a PDA GPS and get the features you need.

GPS systems designed to be used while driving a car, come with spoken instructions advising which direction to turn, how far from destination and other pertinent information. The safety aspects of spoken instructions rather than glancing at a device continually are obvious.

If you only need a guide while walking about, the less expensive and advanced alternatives may be suitable.

Generally, a the most advanced PDA GPS systems come equipped with maps which continually update your location on a updating map, also giving verbal instructions such when and where to turn next. Less pricey options let you transfer non updating maps via your PC or Mac and compare your position relative to your destination.

About The Author

Learn more about PDA GPS Systems and other GPS Tracking Devices at http://www.gpstrackingdevice.net/

Tip: Weather conditions may weaken the signal...The satellite signal is affected by the air it travels through. Rain, clouds, or fog may make GPS reception very difficult.
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Lots of interesting articles from today's PC World. First up, Microsoft Takes on MapQuest: "MSN launches MapPoint online mapping service, offering maps, directions, and more."

Apparently this is going to be yet another component of MS' push for .Net services with hooks into other MSN services. MapPoint is XML-based, which makes it interesting in other ways, and there it launches with a phone-based direction service. The articles notes that this is another step towards location-based services. "For example, you might someday be able to click on a Windows Messenger buddy's name and retrieve a map showing the location of his or her home."

Good or bad? You make the call. I like parts of this, but I'm incredibly wary of .Net.

Write Here, Write Now: And you thought you were overloaded with information now, just wait. Hewlett Packard is working on a technology to let folks print messages in mid-air based on their location incorporating GPS technology. I find this stuff fascinating, even if no one seems to have thought of a good use for it yet. The first sentence of the article is right, though: "The kids are going to love this." in New Scientist via RCPL's Liblog]

When the ALA summer conference was in San Francisco in 1997, the SF Museum of Modern Art had a fascinating exhibit called Icons: Magnets of Meaning. I spent hours browsing through it, but one of the pieces that has always stuck in my mind was called @: Marking the Electrosphere . It talked about the meaning of that one little symbol. How it can define, place, and root you in the world, but at the same time let you be found anywhere. Integrated, widespread use of GPS is going to take this to a whole new level.

Global Positioning Systems offer everything from hole overviews to Internet access "Shortgrass Technologies' Internet-based sports information system and financial ticker enables golfers to check college football scores on a Saturday afternoon or the price of stocks any weekday. Global positioning systems can track golf cars no matter where they are on the course, thus discovering bottlenecks and slower play. Golfers can order beverages and food en route to the turn, so golf clubs can offer more than a quick hot dog - a higher priced chicken sandwich, for instance...."

I always thought that GPS would go mainstream in automobiles first, and in a way I suppose it has, but maybe golfers will lead the real charge. I could have used a portable, library-centered GPS system myself to navigate the Chicago Public Library's Harold Washington Library when I was there last fall!

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