Dead Reckoning and Navigation Quiz nav 3 quiz 2

What distinguishes dead reckoning from GPS-based navigation in terms of data dependency?

• Dead reckoning uses radar feedback and sonar input for plotting.

• Dead reckoning relies on internal movement data, not external signals.

• Dead reckoning depends on satellite updates and autopilot systems.

• Dead reckoning requires visual bearings and magnetic deviation.

When comparing two DR tracks with identical speed but different headings, what factor most influences their divergence?

• The visibility range and weather conditions at each waypoint.

• The directional angle measured from true north on each course.

• The vessel’s displacement and draft during each maneuver.

• The time interval recorded by the chronometer on each leg.

How does analyzing the time-speed-distance relationship in DR help identify navigational risks?

• It confirms vessel stability through engine performance logs.

• It estimates fuel consumption based on voyage duration.

• It reveals proximity to hazards based on projected movement.

• It validates crew readiness by comparing watch durations.

What is the analytical value of plotting DR positions at regular intervals during a voyage?

• It allows comparison between expected and actual track lines.

• It simplifies chart corrections by avoiding tidal calculations.

• It improves fuel efficiency by minimizing course deviations.

• It reduces the need for visual bearings and radar confirmation.

How does dead reckoning assist in evaluating the impact of steering errors on voyage planning?

• It adjusts course automatically using autopilot algorithms.

• It identifies crew fatigue based on helm rotation schedules.

• It confirms compass calibration through repeated observations.

• It highlights discrepancies between intended and actual positions.

What insight is gained by comparing DR plots before and after encountering strong currents?

• It validates the use of celestial navigation for corrections.

• It confirms the accuracy of sonar readings during transit.

• It identifies the location of underwater obstructions and reefs.

• It shows the deviation caused by external environmental forces.

Why is it necessary to analyze the relationship between elapsed time and speed in DR plotting?

• It determines the distance traveled and validates position estimates.

• It adjusts the compass deviation based on magnetic variation.

• It confirms the visibility range under changing weather conditions.

• It identifies the vessel’s draft and displacement during transit.

How does dead reckoning support decision-making when approaching congested or hazard-prone areas?

• It calculates fuel usage and engine load for emergency planning.

• It monitors crew behavior and fatigue during extended operations.

• It forecasts vessel location relative to known risks and traffic zones.

• It identifies radar targets and sonar echoes for collision avoidance.

What factor should be analyzed when DR estimates differ significantly from actual positions?

• The accuracy of timekeeping and consistency of speed input.

• The number of crew members assigned to navigational watch.

• The frequency of radar sweeps and sonar depth readings.

• The visibility of celestial bodies and horizon conditions.

Which justification best supports the use of dead reckoning when electronic systems fail during transit?

• It enables position estimation using internal ship data only.

• It ensures radar visibility for nearby vessel detection.

• It allows sonar-based plotting of underwater topography.

• It provides satellite updates for continuous location tracking.