Which of the following is one of the six DR rules?

Which of the following is one of the six DR rules?

• A. Plot a New DR Position at Least Every Hour on the Hour
• B. Plot a New DR Every Speed Change
• C. Plot a New DR When Obtaining a Single Line of Position
• D. Plot a New Course Line From Each Fix

Answer: (B)

Dead reckoning relies on updating your estimated position as you move, using your last known position, course, and speed. The six DR rules are prompts to refresh that estimate so it stays accurate as motion changes. A speed change directly affects how far you travel in a given time, so if you don’t plot a new DR when speed changes, the projection will drift away from the actual position. That makes plotting a new DR after every speed change the best fit among the rules. The other options describe reasonable navigation practices, but they aren’t the specific DR-trigger actions emphasized by the six DR rules in this context.

Dead reckoning relies on updating your estimated position as you move, using your last known position, course, and speed. The six DR rules are prompts to refresh that estimate so it stays accurate as motion changes. A speed change directly affects how far you travel in a given time, so if you don’t plot a new DR when speed changes, the projection will drift away from the actual position. That makes plotting a new DR after every speed change the best fit among the rules. The other options describe reasonable navigation practices, but they aren’t the specific DR-trigger actions emphasized by the six DR rules in this context.