Can you keep us updated Foxdigger.
Will do mate, be cheap trackers at quid if they work!! App on the phone shows the location of the collar using google maps.... Very simple principle, be interesting to see how it actually does!
I looked at these a month or so ago, the only downside I can see is they not waterproof as such, splash proof & rain proof yes. But then depending on the charging/power system I'm sure splitting it and rebuilding whilst siliconing the seams would work?