I made new map, no changing artemple.map. It doesn't work.
But I add my map to maps.txt, then I change city.txt, making only one entrance in Arroyo and this entrance links to my map. It works, but this is no good solution, because game starts on artemple.map, and when player returns to Arroyo, he goes to my new map. Artemple.map and my new map are same, but when you play on one of them, second will not changes...