Gaza town relic?

I'm assuming you mean Gaztown west on the south island, and that the relic is the one slightly west from the spawn point. It's on a shrine in the middle of the high cliff-face to the west side of Gaztown. I used the wing-suit an parachute to get to it, but it took a few tries, and there was no other way to access it other than the airborne route. There might be a hangglider nearby that makes it easier to get to it than the parchute condidering it's steep rate of descent. Mark the relic with a waypoint to ease your navigation before the jump. There is a gap in the railing by the road above it (and slightly north) where you can see where you have to land where I would recomend you leap from.

Hope that helps, the explanation became somewhat longer than expected...