I agree with IceNitro. I have a smaller and lower SI model (598) and I adjust mine every time I am on the water. I warn anyone who boards my boat in advance that I will be touching my electronics a lot before actually settling down to fish. I have had people complain that I play with my SI too much instead of fishing until I put them right on top of the crappies then that shuts them up. Good luck and have fun.