Thanks to ed H, Beth & the Captain. Whilst this topic has already been covered in some depth, it is good to know that it isn't just me and that differing systems will give different results whilst being in the same ball park, so to speak. I'll stick with the GPS tracker in Anquet as I'll then have some measure of consitency if not totally accurate nor necessarily reliable.
I bought a Plasmic from Cotswold on 4 March and tried it out on the Fairfield Horseshoe a couple of days later. It was dry but there was a cold wind blowing. I have to say that I was disappointed with breathability/wicking as I was wet inside. Perhaps I need to give it another chance and will be interested to read the review and other users comments.
When I'm out walking, I track my route on my Android device using both Anquet OMN and Endomondo. This give differing data sets with Endomondo generally giving a distance of about 5% more.
Another example of this is the Hilley's Dale Head walk which, when the GPX file is downloaded from Everytrail and loaded into Anquet OMN, gives a distance of 3.1 miles with 1,864ft of ascent. The Hilley's recorded this route as being 3.1 miles with 1,425ft of ascent.
Can anyone explain why there is a difference in measurement between the various systems?