The maker of the GO 910 states, “The viruses that were detected present an extremely low risk to customers’ computers or the TomTom GO 910. To date, no cases of problems caused by the viruses are known.”
The company is assuring everyone that it doesn't pose a danger to navigation while driving (how unlucky would that be, driving over a cliff because of a trojan), though they do suggest anyone using those units get it cleaned.
How, exactly, are these “factory” units being shipped with viruses ever? Is it standard for high-tech companies to allow a quality control machine on their network to be used for casual browsing where it can become a liability to the company?