WWII is over? Damn I wanted to move up to Spitfires
To be honest IO540 you are probably right, however as the CAA still say 'don't use GPS as primary nav' nobody should be surprised that it isn't protected in any way and can be jammed or even switched off.
I've never found keeping a plog difficult or particularly tiresome. Unfortunately it's the don't go far, don't read NOTAMs bunch who sometimes think a GPS solves everything. Can't use a VOR/DME and set out with nothing but a battery driven GPS which they barely understand. I know several who use a Garmin 12, yes a very useful unit for ramblers in it's time, hardly state of the art in an aircraft.
I can't say I've ever had VOR/DME reception problems at around 2500' if within the published range??