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The Best Types of Family Vacations
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Valentine's Day: The New BIG Online Holiday
If you think your big holiday rush is over, think again.Last year, Valentine's Day shoppers spent a whopping *$3.9 billion* on the web alone – a 30% increase over 2004. If you’ve got an e-commerce web site and you aren't taking advantage of this market, you're missing out on BIG sales: shoppers spent an average of $144 online for Valentine's Day gifts in 2005, according to a report from online payment processor Verisign; and February 1 was the biggest single shopping day of the period.e but finally on April 27, 1995 it became fully operational. At first, the GPS network was only for military use but in the 80's the United States government authorized the general public to make use of it too.

The GPS network is composed of:

• Satellites

• Earth Monitoring Stations

• GPS receivers

What is a GPS Satellite?

There are currently 24 satellites orbiting the earth is 6 distinct trajectories. Each satellite completes two orbits around the earth each day, traveling at a speed of about 7,000 MPH. At the highest point in their orbit they are over 12,000 miles above the earth. From this height, the satellite signals can be received over a large percentage of the surface of the earth. A GPS unit works by receiving multiple satellite signals and calculating the receiver's position based on triangulation of the different signals. Accuracy is increased with each additional satellite signal that is received so the orbits of the satellites are set so that at most points on the earth there are at lea

>Satellites

• Earth Monitoring Stations

• GPS receivers

What is a GPS Satellite?

There are currently 24 satellites orbiting the earth is 6 distinct trajectories. Each satellite completes two orbits around the earth each day, traveling at a speed of about 7,000 MPH. At the highest point in their orbit they are over 12,000 miles above the earth. From this height, the satellite signals can be received over a large percentage of the surface of the earth. A GPS unit works by receiving multiple satellite signals and calculating the receiver's position based on triangulation of the different signals. Accuracy is increased with each additional satellite signal that is received so the orbits of the satellites are set so that at most points on the earth there are at lea

each day, traveling at a speed of about 7,000 MPH. At the highest point in their orbit they are over 12,000 miles above the earth. From this height, the satellite signals can be received over a large percentage of the surface of the earth. A GPS unit works by receiving multiple satellite signals and calculating the receiver's position based on triangulation of the different signals. Accuracy is increased with each additional satellite signal that is received so the orbits of the satellites are set so that at most points on the earth there are at leae satellite signals and calculating the receiver's position based on triangulation of the different signals. Accuracy is increased with each additional satellite signal that is received so the orbits of the satellites are set so that at most points on the earth there are at least 4 signals that can be received. Of course, this is in theory only since the landscape around you can block some or all of the GPS signals.

What is a GPS Earth Monitoring Station?

There are four unmanned monitoring stations in the US and one manned master station which is located in Colorado Springs, Colorado. The four unmanned stations relay position data from the satellites to the master station. The master station uses the relayed information to correct the position of the sat tiles and sends the corrected information back to the satellites. This synchronizes the data that each satellite transmits to your GPS receiver and ensures that your receiver is always working with accurate information.

What is a GPS Receiver?

GPS satellites transmit low power radio signals that can only be picked up if your GPS unit has a direct "line of sight" to the satellite. The signals can penetrate things like glass, plastic and clouds but not solid structures like buildings or rocks. A GPS unit works by triangulating your location based on the position of