and folding ladders into the water. : The diver sits on the gunwale or RHIB tube facing into the boat, and falls in backwards. Suitable for open boats with low sides. is suitable for boats with low deck freeboard and no gunwale or railing. is suitable for boats with low or moderately low deck freeboard and no gunwale or railing at the entry point. is suitable for boats with moderate to high deck freeboard and no gunwale or railing at the entry point. , suitable for boat with very low deck freeboard and no gunwale or railing. Ladder entry may be used where there is a ladder into the water. Ladders may be fixed, folding or portable, and may be designed for use with swimfins. Lifting platform entry: The diver/s stand on a platform fixed to the boat by the lifting mechanism, and are lowered a short distance into the water. Stage launch: The diver/s stand on a platform called a or basket, which can be lowered by a cable to a considerable distance below the surface. Monitoring and escorting the divers If there is no current, and the divers are visiting a small site and can surface on the shot-line or anchor line, keeping track is nominally simple if all goes to plan, as they will surface at a predictable position which is marked. This is not always the case, and for some dives they will surface away from the marker even when the plan is followed precisely. In other cases divers will not make it back to the shot-line and have to surface independently. If the dive boat is anchored and the plan is for the divers to ascend on the anchor line, it may be necessary to have a tender or chase boat available to follow and pick up divers surfacing off the mark. Spotting and recovering divers surfacing at their own decompression buoys: One system common with recreational divers is for one of the divers in each group to deploy a delayed surface marker buoy (DSMB), also known as a decompression buoy, at the end of the dive. This serves to notify the boat that divers are surfacing, and where they are. It also warns other vessels to keep clear of divers in the water. Following a drift diving group: A group of divers drift diving together will often follow a dive leader who tows a