It is easy to set your destination by searching in map. Also, you can move a pin on a map as you like.
It is an application for iPhone4 or later.
It consumes battery not so much, because it uses region function that came as a new function for iPhone4.
However, continued use of GPS running in the background can dramatically decrease battery life.
I recommend to try free version before purchase.
Please enjoy it.
Notes:Free version is available until end of August or for 2 weeks.