Question 1009Navigation General70% to pass
A Doppler log in the bottom return mode indicates the _______________.
AI Explanation
The correct answer is C) speed over the ground.
A Doppler log in the bottom return mode measures the vessel's speed over the ground, which is the speed of the vessel relative to the stationary seafloor. This is different from the speed through the water, which would be affected by the velocity of any current. The Doppler log determines the speed over the ground by measuring the Doppler shift in the reflected signal from the seafloor.
The other options are incorrect because a Doppler log does not directly indicate the bottom characteristics (A), the depth of the water (B), or the velocity of the current (D). Those parameters would require different types of instruments or calculations.
Related Questions
#1007 A Doppler speed log indicates speed through the water _______________.#1008 A Doppler speed log indicates speed over ground _______________.#1010 Weather information is available from . #1011 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 5.5 seconds after the signal was sounded. What is the distance to the shore? #1012 You are approaching Chatham Strait from the south in foggy weather. You have Coronation Island and Hazy Islands on the radar. Suddenly the radar malfunctions. You then resort to using whistle echoes to determine your distance off Coronation Island. Your stopwatch reads 16.3 seconds for the echo to be heard. How far are you off Coronation Island?