Newbie to GPS - Updating nuvi 660 EURO Question

[thenoo]

I have just updated the map on the above by installing the City Navigation Europe NT 2009 MAP. This appears to have proceeded OK .

However I was surprised to see that this update procedure involves the installation of a very large file on my P.C. also - around 2 Gbts.

Is it necessary to have this data installed on the P.C. as well as being inserted in the GPS unit ? I had assumed that the data would have gone straight from the DVD into the unit without installing anything in the P.C's hard drive.

Is it considered necessary to retain this data on the hard drive after updating the unit ?

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