Fleet News

Minorplanet hits back at system reliability claims

Minorplanet has countered claims that satellite-based vehicle tracking systems could be unreliable in built-up areas.

Michael Bateson, managing director of Siemens Datatrak had claimed GPS-enabled tracking systems could only be accurate 75% of the time in cities, because tall buildings could block satellite signals used to calculate a vehicle's position. The firm claimed using low frequency radio waves provided an answer to the so-called Urban Canyon Effect in cities.

But Minorplanet says GPS-enabled devices are compatible with a system called 'Dead Reckoning', which corrects any errors and verifies the actual vehicle movements, keeping track of location if the vehicle is temporarily lost.

Andrew Tillman, Minorplanet operations director, said: 'GPS signals, like those received by the Minorplanet system, cover almost the entire face of the earth.'

He claimed positions based on low-frequency radio waves could be unreliable in out of the way areas. 'These systems are often lost if the vehicle exits a heavily populated area or moves into Scotland or Europe,' he said.

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