The in-water guide is just that for buddy teams. He/she will dive with anyone who does not have a buddy and will plan the dive based on the needs of those divers. Normally they will dive to between 80 and 90 ft on the first dive and 60 and 80 ft on the second. Usually, it is not the same guide for both dives. The boat crew usually only does 1 dive each, so you need to watch your computers, especially on the second dive, because you will already have a time penalty from the first dive that the dive guide does not need to worry about.
All divers with buddies are encouraged to dive as a buddy team. All Turks and Caicos scuba diving here is wall diving, so navigation is simple along the edge of the wall. You swim to the edge, check the current (usually negligible), and turn left or right until ½ your tank or bottom time. You turn around and come back shallower. We help you find the boat by placing a big blow-up sausage at the edge of the wall where the turn-off back to the boat is. Most moorings are fairly close to the edge of the wall, so you will likely be able to look up and see the boat from here. If not, just swim in from the marker over the plateau, and you will soon see the boat.