The story goes that Soviet military/KGB maps of USSR were so precise and full of details even for unpopulated areas such as forests, my grandpa, who served in

The story goes that Soviet military/KGB maps of USSR were so precise and full of details even for unpopulated areas such as forests, my grandpa, who served in KGB, once secretly took one of such classified maps with him to better orient in a forest when mushroom picking, because civilian-level maps were pretty poor. Once, he noticed that a window in his appartment was closed in a different way than he had left it. Being a KGB man himself, he realized someone had visited his home when he was away. He searched the rooms and found radio bugs, i.e. they were aware he took the maps and started spying on him, suspecting that his goal was to sell those maps to Americans or something like that. Somehow his explanation that he only wanted to have a good mushroom picking experience convinced the superiors, he wasn't charged and stayed in KGB, later becoming a colonel.