Best Location Sharing App

Hey Guys, So long story short- I'm a Canadian teacher living in South Korea with my girlfriend. The other day her taxi was in a car accident and nobody around her spoke English and she could not describe to me where she was or how to get to her. Although she was fine this time, this is obviously a panic I would like to avoid in the future. My question is, what is the absolute best/most accurate way of describing to me (via app) where she is? Google maps? Latitude? Something I don't know about? She is iOS, I am Android. Any help would be greatly appreciated!