If you go for a sat nav with European maps, then the update is likely to be around 2GB... possibly more. Map updates will mean downloading a new map and not just updates to the existing map data.
So for the month when you're updating your Garmin you're going to use all your monthly allowance. So do it at someone's house without such a low limit for broadband.
I can only comment on TomTom for maps, but the size depends on device and the actual map coverage. So for example:
- TomTom GO Live 1005 Western European maps are 2.7GB but the European map is over 3GB
- TomTom GO 720 Western European map is only about 1.8GB with the European map 2.5GB
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Garmin Downloads 