Every time I take someone new, I spot their first several shots for them. The only word I use when spotting is, Lower. It gets repeated several times, louder each time, before they release, then they almost always shoot over the fish. The higher the platform is on the boat, the less refraction you have to compensate for. Also during the daytime, if your shooting in weeds, gar will be sunning, right on top of the water. If you're shooting rolling gar be ready for plenty of snap shooting. Have fun.