Which fix is defined as the common intersection of three or more LOPs at a common point from simultaneous observations?

Which fix is defined as the common intersection of three or more LOPs at a common point from simultaneous observations?

• A. Electric Fix
• B. Dead Reckoning
• C. Running Fix
• D. Visual Fix

Answer: (D)

Visual fix is the position determined by the common intersection of three or more lines of position drawn from simultaneous observations. In practice, you take bearings to multiple visible references (landmarks, stars, etc.) at the same moment and plot the resulting lines of position; where they all meet gives your location. This relies on simultaneous data from several references to converge at a single point, which makes it more accurate than using fewer lines or non-simultaneous observations. The other methods are not defined this way: a dead reckoning position is extrapolated from last known position and course/speed, a running fix uses two consecutive observations, and an electric fix derives from electronic navigation aids rather than simultaneous visual LOPs.

Visual fix is the position determined by the common intersection of three or more lines of position drawn from simultaneous observations. In practice, you take bearings to multiple visible references (landmarks, stars, etc.) at the same moment and plot the resulting lines of position; where they all meet gives your location. This relies on simultaneous data from several references to converge at a single point, which makes it more accurate than using fewer lines or non-simultaneous observations. The other methods are not defined this way: a dead reckoning position is extrapolated from last known position and course/speed, a running fix uses two consecutive observations, and an electric fix derives from electronic navigation aids rather than simultaneous visual LOPs.