I would also like to add i don't really understand mine that well sometimes i mess about with the settings a little, usually use the narrow beam sensitivity set about 80% or so, then I just chuck it out and usually all I find is loads of weed, then If I find a clear or clearish spot just feel for a drop and hope for the best, in an ideal world I know my spots already and don't use it, but it does help you find things you wouldn't find in a month of Sundays,or as above with minimum fuss and disturbance, in many ways a lead is better or still essential but it does help a bit, for example I have fished one swim a lot and I never knew there was a nice raised hump until I chucked the deeper out, for now this is covered in weed but it will become a spot once the weed dies back, to clear it would make the swim look too fish able so im holding off 😂