He must have checked the place out, recced it. He's thorough, he'll have done it more than once.
(Can we date this quote?), Taken Out (Acorn Independent Press, →ISBN):
“These are your targets, they've all been recced. It has taken months to get this info so don't lose it!”
2017, Rudy Noriega, Yellow Arrow Fever: The Grumpy Pilgrim's Guide to Santiago (→ISBN):
The walk out of León is not an easy one, even when you've recced it. There are no major physical challenges but the route is not direct, particularly when there's a medieval market in the way.