Dead Reckoning uses which data?

Dead Reckoning uses which data?

• A. Starting Point, Course & Speed, Time & Distance
• B. Visual Fix
• C. HF Communications
• D. Set and Drift

Answer: (A)

Dead Reckoning estimates your current position by starting from a known point and advancing along a chosen course using your speed over time. From the known starting point, you follow the vessel’s course and maintain its speed for a measured amount of time (or equivalently, travel distance). By combining the starting position with the distance traveled along the course, you arrive at the estimated position. This requires data on where you started, the direction you’re steering (course), the speed you’re making, and the elapsed time (which gives distance traveled). That’s why the data set described as Starting Point, Course & Speed, Time & Distance is the correct set. Visual fixes rely on external observations to determine position, not on the forward calculation that DR performs. HF communications might provide updates but aren’t the data you use to compute the DR position. Set and drift describe environmental effects like currents and wind that can cause actual motion to differ from the intended course; they’re factors you’d consider to adjust DR, but they aren’t the primary inputs used to perform the basic dead-reckoning calculation.

Dead Reckoning estimates your current position by starting from a known point and advancing along a chosen course using your speed over time. From the known starting point, you follow the vessel’s course and maintain its speed for a measured amount of time (or equivalently, travel distance). By combining the starting position with the distance traveled along the course, you arrive at the estimated position. This requires data on where you started, the direction you’re steering (course), the speed you’re making, and the elapsed time (which gives distance traveled). That’s why the data set described as Starting Point, Course & Speed, Time & Distance is the correct set.

Visual fixes rely on external observations to determine position, not on the forward calculation that DR performs. HF communications might provide updates but aren’t the data you use to compute the DR position. Set and drift describe environmental effects like currents and wind that can cause actual motion to differ from the intended course; they’re factors you’d consider to adjust DR, but they aren’t the primary inputs used to perform the basic dead-reckoning calculation.