In reply to All:
Many thanks to all those who replied to the question posed.
A number of points were raised and some excellent, experienced, hands-on information given.
In my own opinion there is no substitute for a 1:25000 map, prismatic compass and a protractor of which A to B bearings + Magnetic Variation and distance, have been worked out prior to setting out, I have used this method for many years. Whatever GPS system I purchase, it will be used as a secondary checking tool, navigation aid only, however, the back track facility could prove dividends in extreme WX conditions or for safety reasons, I’m sure a major consideration for all SOTA activators.
Judging by all responses, varying types/makes/prices have been made reference too. As I said at the beginning, only interested in marking in Grid References as Way Points between car park & summit activation area, direction indicator and the Back-Track facility. Vertical height accuracy through barometric altitude is a good feature but easily established through contour lines on the map and other linear features, therefore is not a necessity, we just keep going till we reach the summit.
Two or three responses make mention to the basic Garmin Etrex (the yellow one) and describe as reliable, cheap and weatherproof, basically does the business and fits the requirements for an activation, so therefore may bounce this way.
Again many thanks to all for their responses………….