I do it all the times (shore and chartered) except when diving at resorts where guided dives are the norm. On local charters, sure you will get a site briefing by the boat captain but the planning and conduct of the dives remain divers responsibility. Last Feb I spent a week on Blackbeard with a group of divers and beside the site briefings the dives were ours to plan and do (with the exception of two drift dives). I am going wreck diving with my GF in the Great lakes mid-July...same concept and my next trip down South is planned for Bonaire...two weeks of shore diving in Feb 2012 where a group of us will be planning and diving all our dives.