Mark it with a waypoint and try air dropping then parachute landing on top of it.
That said, since air drops continuously and randomly respawn, it very well may despawn as soon as you air drop, or even when you move too far away from it. This game constantly does that with NPCs, most likely to regulate hardware resources. I've had cases where a shopkeeper is like 30m away from me, and if I turn around and head a little ways to kill enemies, he's gone when I look back, and when I say gone he doesn't even show on the map.