under the radar

With me, I flew under the same bridge twice, and it reset them, or took some away or what not. So I imagine you flew under tha same one twice.

If you go to stats, it should say how many bridges you've flown under, either under 'Miculaneous' or 'Score' Check them, to see how many it says. If it says the number you need for the achievement, well I dunno. Some Rockstar games have been known the have 'laggy achievements' meaning it will come through a while after you complete it. Not sure if this is the case for GTA though.

I thought there were more than 13?

Anyway, each bridge comes up as a trophy on the map, so you know which bridge to go under.
Remember, it's only certain bridges that count, you can't fly under any old bridge.

Theres 15 in tolal and one on the 3rd iland you have to fly betwen the serports under of 1 of the briges

Your missing a bridge mate there are 14

The way I did it I went in order. From the helitours go to the closest bridge; after going under, go to the next closest one, etc. To know where you're going mark the next bridge with a waypoint and so on. That way you wont forget which ones next and wont miss any.

Rate high please!!

Basically there are 13 bridges and when you go under one a trophy will pop up over every other 1 you need 2 complete the achievement. It works best if you fly under one then pull up your map, after that just mark a trophy and it should take you str8 2 you're next target.

14 bridges.