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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 readersHaving 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 OldakerNuneaton, Warwickshire• I can’t be the only one to think that if you can afford to quaff champagne on a regular basis, that would tend to lead to a more positive outlook and greater life chances generally (Drinking champagne could reduce risk of sudden cardiac arrest, study suggests, 29 April).Deirdre BurrellMortimer, Berkshire Continue reading...

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