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Navigation with no 3G

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In my several trips to Vancouver BC without 3G, I experience the same functionality as BrianMan's description: You see the thick orange path, but the map tiles goes black on the 17" - mine has tiny sentences that say something like "no map available".

The turn-by-turn on the driver's screen works, the small panel on the upper left on the 17" works. Voice turn-by-turn works.

Here is a tip based on what I tried in my recent tip. While waiting at the border to cross over to Vancouver, I entered my hotel's address. Then, I zoomed onto my current location and start panning the map along the route on the 17" all the way to the hotel. This caused the map tiles to cache. Then, on my drive past the border, the map tiles worked even after I lost 3G. However, it worked only at the zoom level that I had while panning at the border.

Slacker does not work - no caching :)