First of all, there are a couple of things maps do really well:
They are big, so you can see the whole picture clearly
But you can also fold them to see exactly what you need
They can show you, with a high level of precision, multiple places at once
Those are very important feature, for me. Much more than showing you that "you are here", or that ...
Back in 2014 I was climbing Ben Nevis, where the weather was relative calm on the climb. At the time, I didn't truly appreciate how fast weather conditions can actually change, so to my surprise, I was shocked when a heavy fog felt like it came out of nowhere and disorientated me. My tips would be:
Bring a camera with you, taking photos of quite obvious ...