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Get a LARS, learn to use the navaids or buy a GPS
I don't think a LARS unit is very happy with a pilot who is unable to navigate on his own. Sure they will help if asked though. But they tend to be busy enough.
Navaids are a bit of a problem. One can fly anywhere in Class G, and anywhere below Class A (VFR) with a clearance. One is outside the useful reception of a navaid, never mind within its DOC, over most of the UK surface, especially if pottering about at the low levels where many VFR pilots fly.
Yet, a PPL is legal to fly down to 3000m vis.
One can't really reconcile this, other than the usual "a PPL is only a licence to learn" statement.
The best thing the CAA could do for all this would be to make a decent size panel mounted GPS mandatory, and incorporate the training into the PPL. Not a lot of schools would like to pay for it though...