I am looking to buy a GPS just as a backup. As I plan on doing quite a lot of flying across Europe.
Here we go again
If you want a GPS as a backup, don't bother. Using one as a backup is a bit like driving a Vauxhall Viva, towing a brand new BMW just in case the Viva breaks down.
If you want to use a GPS properly, you need to get onw with the biggest moving map you can afford. Situational awareness comes from the moving map.