Portable Communication

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Satellite Navigation Systems

Mobile Phones

Portable Media Players

Bluetooth

Global Positioning

Systems

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Handheld computers

Portable DVD Players

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Mobile Phones

• They work by transmitting electromagnetic radio waves. They have a receiver to transmit/receive data from the nearest mobile tower.

• Used for making calls and business. Useful in areas where land line is unavailable. It is also a convenient way to send urgent messages

Advantages DisadvantagesCan be used while travelling Cost more than landline.Can be used to send photos Quality of photo can be poor

Can loose connection if going through a blind spot.

Small displayLimited batter life

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Portable DVD Players

• Work just like normal DVD players but have a built in screen. They are used for personal use like in cars for the passengers.

Advantages DisadvantagesSmall and compact Screen is of low

resolution Play music CD’s Viewing quality can be

poor.Screen is small

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Portable Media Players

× Basic devices used to store music.× Can be used for downloading music. × They can have built in small hard disks, micro drives, or flash

memory depending on the manufacturer.

Advantages Disadvantages Compact Small screens Hold up to 100GB of data Earphones may be of low

quality

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Global Positioning Systems• They work by making use of satellites that orbit the earth. • Receivers are used in navigation + for drawing maps.• Exact position of receiver can be determined by carrying out calculations

based on the position of satellites and time taken for satellites to get to the receiver.

• GPS can be used by runners

Advantages Disadvantages

Can be achieved regardless of the surrounding terrain.

Transmission may be slow at times

Greater accuracy. Expensive devices.

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Satellite Navigation Systemsit has 2 functions:1. GPS calculates position of the driver2. Stored date consists of data about all the roads in the country.• It is often used by drivers to produce a route for their cars.

Advantages Disadvantages

Quicker to use than a road map

Small display

Receive up to date traffic conditions

Unsuitable roads can be recommended.

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Handheld Computers • Have small screens and keyboards.• used where power cannot be relied upon.• Example: PDA. • Used by people whose job requires them to be travelling a

lot.

Advantages DisadvantagesCan be used away from the place of work

Difficult to enter much text.

Easier to carry than laptops As expensive as laptops Limited operating softwareLimited application software.

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Bluetooth

• Uses radio waves to connect devices.• Maximum distance is usually 10 meters. • Transfer rate is 1 MB/s• Can communicate between a headset and mobile.• Can be used for game consoles for wireless

controllers.Advantages Disadvantages

Used for a variety of applications

Data transfer rate is slower than that of WiFi

Cheaper hardware than WiFi Covers smaller distances than WiFi

Consumes less power than WiFi