Wireless generally refers to any electronic device not connected to an electronic conductor or wire. Wireless operations allow longer range communication. It is incorporated in many applications.
Wireless technologies today are being applied to voice and messaging devices, Internet-enabled devices and data networking. Voice and messaging devices include cellular phones, two-way business radios, and pagers. These gadgets operate within networks that offer nationwide coverage. Some of the more popular providers are AT&T, Sprint, and Verizon. They operate in varying frequency bands as directed by the FCC.
The Internet -enabled mobile phones and personal digital assistant (or PDA) are devices that can be connected to the Internet. Both the wireless application protocol (WAP) and wireless markup language (WML) were designed to enable these devices to connect to the Internet.
Wireless data networking devices include a router, USB adapter, and access points. Wireless router is a device found in WLAN. Its job is to specify the network point to which a packet will be forwarded. A packet is a unit of data transported between an origin and port in the Internet. This device can also operate as a hardware firewall. It provides security against hacking because the IP Address of the computer is not directly exposed to the Internet. The new model uses 802.11g that can transmit up to 54 megabits per second.
Universal Serial Bus (USB) was designed to allow peripherals to be connected in the computer with the use of a standard interface socket. A USB adapter is used to attach a USB-port device to a non USB-port device. USB3.0 is the newest specification introduced in the market today. It has a transmission rate of up to 5.0 gigabits per second.
Access point is a base station, a LAN with the use of Ethernet cable. It receives and transmits data between WLAN and the wired network infrastructure. Access points support the standard of Wi-Fi communication.
Bluetooth is a technology specification designed for short range communication between mobile phones, personal computers, and other portable devices. This technology is being used by a lot of companies such as Ericsson, Nokia, Motorola, IBM, Intel, and Lucent. Bluetooth covers a distance of up to 10 meters in a 2.4GHz band.
One of the newest products in the world of wireless technology is GPS or Global Positioning System. This device can provide an accurate time and location data for unlimited number of people in any place of the world. This system has three segments (components): the space, the control, and the user segment. The space segment consists of 24 operating satellites; it transmits one-way signal that gives GPS satellite position and time. The control segment is composed of worldwide monitor and control stations. It keeps the satellites in their proper orbits through command maneuvers. It also adjusts the satellite clocks. The control segment tracks GPS satellites and uploads navigational data.
The user segment is made up of GPS receiver equipment. It receives signals from GPS satellites. The transmitted information is used in calculating the user’s position and time.
GPS System Top Sellers
Garmin Forerunner 305 Handheld GPS Receiver
This is the GPS personal trainer version. It tracks and stores information that charts pace, time, distance, and heart rate.
Garmin nuvi 660 Car GPS Receiver
Features include language guide, world clocks, calculator, speaker phone, and blue tooth. It also has a larger screen which measures 0.9 x 4.9 x 2.9 inches.
Garmin Zumo 550 Car GPS Receiver
It is specifically designed for motorcycles. This gadget is built with waterproof and fuel-resistant plastic. It is preloaded with City Navigator NT street maps. It also has voice directions, and real-time traffic and weather updates.
Humminbird NS25 Car GPS Receiver
Features include chart plotter and fish finder. It has a single beam transducer and split screen view option to show sonar information. Sonar information contains fish ID, structure ID, and fish depth.

Amazon.com — January 8, 2008
The nüvi 780 adds enhanced MSN direct content to themulti-destination routing and “Where Am I?” features and gorgeous widescreen display of other nüvi  700s to create a superior navigation device for business as well as casual drivers. As with all nüvis, you get Garmin reliability, the fast satellite lock of an integrated high-sensitivity receiver, a slim, pocket-sized design with a gorgeous display, an easy, intuitive interface, and detailed NAVTE (more…)

Amazon.com
Garmin’s nüvi 265WT improves upon its 200-series predecessors by adding free real-time traffic updates from Navteq (for the life of the device) as well as Bluetooth connectivity to your cell phone. Other significant improvements in the 2×5 series include a predictive technology that provides faster satellite lock, a redesigned screen with more information, terrain maps, and an exciting new photo navigation feature. The 265WT provides complete maps for North America and t (more…)

Amazon.com
Garmin continues to build up its nüvi 7xx series portable GPS navigators with its nüvi 765T, which adds a number of handy routing and communication features to an already impressive list of specs, including a 4.3-inch widescreen display, text-to-speech capabilities, media player, and FM transmitter for transmitting audio–including directions and MP3 music and audiobooks–from the device to your car radio. Garmin’s nüvis pack top of the line features into a slim form (more…)