@pedestrian – you make a fair point. I think there are two issues here.
The first is attitude and competence – someone who has no clue what they are doing and no desire to learn is going to be at risk whether they are carrying a phone or not. I’m not convinced that Google Maps and the like has made this issue significantly worse – I met plenty of woefully unprepared people in the hills long before smartphones came on the scene.
I have an ex-housemate who got himself lost at night on Dartmoor and had to be rescued by ‘copter. Even if he did have mapping on his phone he wouldn’t have known how to use it. He doesn’t have the slightest embarrassment about the incident and seems to view SAR as a taxi service. He declined my offers to teach him navigation and seems to have learned nothing from the experience, so he may well end up in the same situation again. I suspect that there will always be people with this kind of attitude, though better education might reduce the numbers.
The second issue is to help people who do want to learn make informed decisions about what tools to use in different scenarios. That’s what I was trying to address in my post above. Clearly the ideal is someone who is competent in both traditional and GPS navigation and has a clear strategy for choosing the right balance between the two approaches for each trip.
Finally, 100% agree with Roger’s points. Altimeters are a much under-appreciated tool, especially on really steep ground as he says. I still use my lovely old Thommen, which I got off a mate in the ’70s who had taken it up Everest when that still meant something. I’ve just bought a phone with a barometer, so sadly it’s about to be retired. And I would never rely solely on an e-compass – not remotely reliable enough. I carry a traditional baseplate compass on every trip, secured by a lanyard as I’m just about absent-minded enough to lose the thing.