Once the signal starts bouncing around under tree cover, I start using the distance reading to home in on the cache. The direction arrow becomes useless, and takes a bit of time to correct tiself anyway. Using the distance reading is faster for me.
Like someone eles suggested, take along a compass also. Align it with the direction arrow on the GPS unit and then go the distance indicated. That's how it's done when orienteering with a map and compass, and still works today.
Lone Duck
The Quack Cacher