A satellite navigation system works using destination details entered by the user, either a new destination or chosen from previously saved destinations. The satellite navigation system will then output directions to the destination in the form of either a visual map or a list of directions. A satellite navigation system is an example of a computer system that is made up of sub-systems. This structure diagram shows some of its sub-systems.

1. (a)Complete the diagram by filling in the empty boxes. The diagram's structure is as follows: - Top-level box: 'Satellite navigation system' - Branches to two boxes below: - Left box: 'Input destination' - Right box: (blank) - 'Input destination' branches to two blank boxes below it. - The right blank box from the top-level branches to two boxes below it: - Left box: 'Map' - Right box: 'List'[2]

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