It would be nice if there were a way to send a text to someone to tell them my location. It also often arises that I want to tell someone where something is that I am looking at on the map. I don't know if that's two features, or one. Doesn't seem like it would be too tough to do--most map apps seem to have at least the first one.
There are some apps that have functions that send a continuous stream of messages, updating someone as to your whereabouts, but that's not what I need.