This application shows you points of Struve Medidian Arc. Register by entering e-mail. After you are registered and visiting of of Struve point, your phone will automatically mark this point as visited. Visited points are shown in this page. If you are visited all 34 points, you will get prize.

Read about Struve Meridian Arc

Philatelists are made entire series of Struve themed postmarks

Probably this is Võivere-Simuna basline measurment picture.

Points to be visited in PAIK tour

Belarus points

Beginning of arc in Norwegian arctic ocean

And end in Ukraine