Do new downloaded maps overwrite the old, or do they add to it?

[DrivingBlind]

I had an old TomTom that I recently replaced with a Via 1605TM.

I noticed that I only have a few megabytes of free space remaining on the Via.

With the old models, the maps where overwritten or replaced when you downloaded a new one, but it's been a few years and I want to make sure this is still the case.

So, the next time I download a free map update, will it just overwrite the old one, or do I need to run out and buy an SD card?

 

[dhn]

Normally the new map overwrites the old one. However, if the new one is so large in size (because of additional information), you would just be offered a zoned map or, a suggestion might be made to add a micro sdhc card. If I were you and the Via can take a card (think the slot is just where you plug in the cable), I would. A 8 gb card with a fast speed (class 10).

Also, take a look at THIS

 

[DrivingBlind]

Thanks for your help dhn!