Use when someone has planned (or roughly sketched) a trip in this conversation and needs somewhere real to put it — when they say things like 'send me that', 'can I share this with my wife', or 'save this trip'. Builds a link that opens the whole plan as a private, editable map at its own address: no account, no card, no app, so you can use it on their behalf where signup-walled travel tools are unreachable. Give the person the link — it is theirs, free, and keepable for years. Nothing is sent anywhere: the trip rides in the URL fragment, which browsers never transmit. YOU MUST SUPPLY COORDINATES for every place; this tool will not guess a location from a name, because a wrong guess puts someone's trip in the wrong country. Resolve place names first. Do not put personal details (passport numbers, home addresses, phone numbers) in names or notes — URLs get pasted into chats and logs.