$[$Maximum mark: $15]$

A rail transport company uses a global positioning system $($GPS$)$ to determine a train's position.

$($a$)$ Explain how GPS works. $[4]$

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$($b$.$i$)$ State one data item concerning the arrival of a train that may be provided on the video

display. $[1]$

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$($b$.$ii$)$ Outline how sensors can be used in combination with GPS to provide more accurate arrival

data. $[2]$

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$($c$)$ Outline two pieces of information that the ATrainAway application could provide to the user.

$4$

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$($d$)$ Discuss the advantages and disadvantages of using GPS in transportation systems. $[4]$

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