I don't think it's been mentioned on here, but changes to the FRA rules for the coming year include:
"The use of GPS devices (or similar technologies) to assist with navigation or positioning in any way is now completely prohibited in all FRA races. This includes (but is not limited to) display of a map, fixing current position, following a “breadcrumb trail”and any “off-track” visual or audio warnings"
"Runners who use such a device –even momentarily for repositioning –must retire and declare themselves non-competitive to the Race Organiser"
and aslso:
" A note has been added to confirm that ROs may require that competitors do not wear e.g. GPS watches even for tracking or distance display."
GPS was banned in Wales, where ir was considered to be contrary to the spirit of the sport, a couple of years ago.