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Not compulsory but as i'm often solo out that way (more time to be done there) it'll be useful backup so family can be checking. Also finally download some of the kml files it's saved and they're pretty cool, although better with more regular refresh rate (2 mins at most I think). Will check out the KP one more thanks as well as that @aggi mentions below (thanks also) which gets lots of good reviews on amazon at first glance...
"Smart"phone running Racedrone for tracking but doesn't last more than 6hrs really so power boost needed.