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These companies send drivers out on the road every day to map the roads.They are typically equipped in a van with an extremely sensitive GPS receiver and sometimes a few video cameras.It would be nice if this significant delay could be reduced.However it appears this scenario will continue for the near future.

Regardless of your GPS manufacturer, chances are good the maps come from one of those two companies.They need to convert the data into their own internal formats.The GPS companies also write the programming for calculating routes which is why different GPS systems often calculate different routes even though they have the same underlying map data.You may purchase street map packs as downloads, or as SD card updates.I actually prefer SD card updates for their simplicity and ease of use.