Dead Reckonings is a term used to describe the process of estimating one's position without the use of modern navigational tools. It is often used in sailing and aviation, and involves using the speed and direction of the vessel or aircraft, as well as other factors such as wind and current, to calculate the position. The crossword solution for this term is OBITS, which stands for Oceanic Bathymetric Information System. This system is used to measure the depth of the ocean and is an important tool for dead reckoning.