Ron wrote:A cattle boat diver is a largely helpless minimally trained scuba diver only capable of making dives when he slovenly arrives at a six pack (six passenger) dive boat and follows a dive master. He or she could not, without assistance, plan, prepare and execute their own dives. Primarily found in warmer waters.
I like that description. To add to the definition, a subset are also perfectly capable of telling you what you are doing wrong that doesn't comply with the proper, correct and sanctified procedure they learned the weekend they got certified, although they themselves are incapable of putting procedure into practice. Been buddied up with loads of 'em over the years.

"The diver who collects specimens of underwater life has fun and becomes a keen underwater observer. .. seek slow-moving or attached organisms such as corals, starfish, or shelled creatures." (Golden Guide to Scuba Diving, 1968)
