deepsea21
Contributor
I pulled my aluminium and steel tank weight stats from another website as well so I guess there is some disagreement even among the pros who supposedly study all this stuff. Anyway, I will stick with the basis of my prior recommendation for new divers and that is to dive with the tanks they know. If this group were staying for a week by all means they could give steel tanks a try if they wish but having only one dive trip in Coz to fit in the time the cruise ship provides I believe they they should dive with the tanks they know.
The right dive op with a private DM is going to take them on a shallower dive than the rest of the divers on the boat. As such, an 80CF tank is going to deliver just as much bottom time for them at the 40-50 ft they'll dive with their private DM on the top of the reef as the more experienced divers will enjoy starting at 80'+ and working their way up. As such, all on the same boat will enjoy about the same bottom time. Even a total air hog will experience about the same bottom time at 40' as the experienced divers will realize at 80 ft.
The right dive op with a private DM is going to take them on a shallower dive than the rest of the divers on the boat. As such, an 80CF tank is going to deliver just as much bottom time for them at the 40-50 ft they'll dive with their private DM on the top of the reef as the more experienced divers will enjoy starting at 80'+ and working their way up. As such, all on the same boat will enjoy about the same bottom time. Even a total air hog will experience about the same bottom time at 40' as the experienced divers will realize at 80 ft.