Handheld computer recording address data
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Concern over Royal Mail GPS scheme

19 July 2012 Last updated at 13:53 BST

The Royal Mail has begun a trial scheme across East Anglia pinpointing the exact location of homes and businesses and plans to sell on the information to sat nav companies.

Postal workers are using handheld computers to record the exact location of homes and businesses.

But there are concerns that it is an infringement of privacy.