You denigrate GPS systems too easily but forget a major wakness in the qtk system.
The coverage area for Qtk is not great.
In Melbourne, if you live outside of Sunbury( say Gisborne) or if you live in Packenham there is no coverage.
In Sydney if you live in WoyWoy, Springwood or Camden then no coverage.
Every system has their weaknesses.
QTK
quiktrak networks limited
