We had great fun with this. We did it without a GPS and were 4th to find.
Out on Tuesday evening with CC2 - we easily found nano #1 and then thought we'd attempt the next by dead reckoning. Surprised ourselves by successfully finding #2 and then #3. On each occasion we retreated a safe distance to sign the log but wherever we sat it seemed to be on the route that a lady had chosen to walk her two dogs (one huge and friendly, the other small and annoyingly yappy).
On Wednesday evening with CC2 and CC3 - we found the tricky nano #4 but had abort our search for #5 as it started pouring with rain.
Out again tonight to finish it off. CC2 found #5 easily which gave us confidence to try dead reckoning again. Paced our way off to #6 and CC3 found the thing that matched the clue. Then on to the final cache - CC2 stuffed it up his jumper while I pretended to make a phone call.
Took the dice and the smiley ball. Left Cybersafe and the cat-hedgehog.