I like real maps, but mobile phones can be vital in an emergency | Brief letters
Using GPS in the wild | A toast to healthy hearts | Staffing self-checkouts | Digital assistance | Happy birthday, dear readers
Having rambled for 65 years with Ordnance Survey maps and a compass, I agree with John Harris about using GPS in the wild (We now leave navigation to our phones. The result: more of us are getting hopelessly lost, 27 April). A phone screen is too small to see the wider terrain. But having carried an emergency whistle and pocket heliograph, I have to admit that phones can be a lifesaver in a real emergency.
Joe Oldaker
Nuneaton, Warwickshire