Which position is not part of the three positions assigned in the rescue boat’s transmission?

The position referred to in the rescue boat's transmission that is not part of the standard three positions is full. In the context of rescue boats, the three primary transmission positions typically include neutral, reverse, and drive.

Neutral allows the engine to run without propelling the boat, providing safety during certain operations such as starting the engine or when the boat needs to be stationary. Reverse enables the boat to move backward, which can be critical in various rescue scenarios for maneuverability. Drive is the forward position that propels the boat ahead, which is essential for making progress towards a rescue target or navigating in open water.

In contrast, "full" is not a recognized position in this context. It doesn't correspond to any specific operational mode in the standard transmission functions of rescue boats, thus confirming that it is the option that does not belong within the established framework of operational positions.