Travel apps show borders and restricted zones, but rarely the rules for crossing them. After being turned away in Bulgaria's Rila Mountains, I'm asking how mapping platforms actually keep these restrictions accurate.

Most operators specialize in one line. A car rental company stays in transport, a boat operator stays at sea, a land tour team stays on the road. The moment you start connecting those pieces, the real work begins. And what I've learned is that the destination is rarely the hardest part. The handoff is.