GPS technology

Mind Map by , created over 6 years ago

GCSE GCSE ICT Mind Map on GPS technology, created by JThornton on 05/08/2013.

Created by JThornton over 6 years ago
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1 Prolonged use of mobile phones can have health implications. Give examples of these.
1.1 The reviewers said: “The substantial body of evidence highlighted in this report suggests that mobile phone use may be linked with a range of important health problems. These include, but are not limited to, brain tumours and the evidence has serious implications for public health. Although further research is needed, it makes sense to err on the side of caution in the meantime.”
1.2 How they do it
1.2.1 Cell phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues closest to where the phone is held. The amount of radiofrequency energy a cell phone user is exposed to depends on the technology of the phone, the distance between the phone’s antenna and the user, the extent and type of use, and the user’s distance from cell phone towers. Studies thus far have not shown a consistent link between cell phone use and cancers of the brain, nerves, or other tissues of the head or neck. More research is needed because cell phone technology and how people use cell phones have been changing rapidly.
2 Bluetooth is used in the Easy Walk service. What are the limitations of Bluetooth?
2.1 1. Speed. Bluetooth is not designed for high-speed data transfers.
2.2 2. Range. The range of communications is often limited to a few feet (I've seen as few as 2 and as many as 30).
2.3 3. Compatibility. Some devices do not have profiles compatible with the devices you want to connect with.
3 What is GPS technology? How does it work?
3.1 The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.
3.2 Global Positioning System satellites transmit signals to equipment on the ground.

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