Found it!

Half Term Grandparenting. Beautiful day. What new challenge can we try?

Answer: Geocaching. Basically a Geocache is a waterproof box or cylinder which you try to find. I believe the number hidden around the world is approaching 3 million.

You download an App and using GPS you are guided near to box and then have the final challenge to find it. Inside the box you sign your name and if you wish exchange small gifts.

You then record via your phone that you have found it.

As the photo shows we found our first one. There are seven within one mile of grandchildren's house.

I know that at least one of my blip followers is an enthusiast.

A healthy change from screen games.