QuoteYour GPS will have Garmin's 100k topo pre-loaded. This map is not routable, and is not very highly regarded by most people. That being said, it certainly has its uses. The advantage is that you get coverage for the entire US and it's always available without installing anything else.
I'm guessing that bcz I'm in Europe I'll get the whole of Europe at 1:100k?
Yes, "routable" means that the map supports turn by turn navigation. Maps have to be made in a special way to support this. The 100k topo, and almost all maps on this site, are not routable. That means it will show your position on the screen but there's not data about the roads that can be used to generate a route with turn by turn directions.
Garmin's 24k topo maps are completely different, they contain the same routable roads as City Navigator. But each map only covers a few states and it's expensive.
Ok got it now - but I'm guessing for hiking that I'll be perfectly fine with the "direct routing" that you mention, provided that there are enough points to navigate to.
QuoteThis data is completely separate from the map and can actually be used without any map at all.
Lightbulb moment! Many many thanks!