Dead-reckoning refers to the process of estimating the position of a ship or aircraft by measuring the distance, time, and speed traveled. However, there are several synonyms that can be used to refer to this process. Some of these include deducing, inferring, calculating, computing, and gauging. Another synonym for dead-reckoning is "navigation" which refers to the act of travelling from one place to another using maps, charts, and other navigational aids. It is particularly helpful in areas where there are no visible landmarks or where GPS signals may be unreliable. Regardless of the terminology used, dead-reckoning is a vital process in maritime and aviation industries that helps ensure safe and effective travel.