I have a few GPS units but tend to navigate mainly using the sun, time and mental image of the map (photo/video graphic memory help me here). I always carry the map and compass and will sometimes refer to those. As Dougie said above be observant, look at features around you, and very importantly behind you, particularly at forks in rivers and streams and ridge lines as you go. When you really know how to read a map and convert the contour lines into 3D images in your head you can normally get a very accurate position from just looking around and holding a map.
Yes I am more than up to date with modern technology but I also learnt the old school stuff. The old tech drawing at school helped a lot to with a lot of map and trig work involved so I know it very well.
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