Instead of all "Where are you?" calls and texts, you can just send a "ZinSoo SMS" to your friend and he/she can easily find your location on map.
Also if your friend has a ZinSoo SMS on his/her cell then he/she can see the direction and distance to your place.
Imagine that you want your friend to find you in a big crowded place like a square or an exhibition. You may need to call each other some times and give some signs to describe the exact place you are standing to find your friend. But if you and your friend both have "ZinSoo SMS" then with sending just one message from ZinSoo SMS to your friend, he/she could exactly come to the place, you're standing, by following the arrow on his/her mobile screen. There will also be a number representing his/her distance to you, so your friend knows how far you are.
By the way, the word "ZinSoo", means "from this direction" in Persian.