I don't think the map should show where you are. You should instead use the map to navigate. Just drag from one point to another. You don't see yourself on a map, now do you?
@GoodyGoodman
Using the LEFT cannon, hit the very bottom of the left post with full force (The pointer should be at the very right, so the right cannon will fire very weakly). This should cause the left post to tumble backwards. After it falls, simply aim your LEFT cannon at "here". Hope this helps!