Man, this app is taking me too long to develop, too much work at the factory and too much procrastinating. :(
However, there is progress, I have the navigation screen at 50%, at the moment it shows the distance to the target and the speed at which you are traveling.
It shows the distance in feet, miles, meters and kilometers, the speed is shown in km/h or mph.
There are a pair of screenshots:
It will show the target in the black square as if it were on a radar screen, switching the "one/all" control will show the other locations in range.
Hope to post the next entry sooner.