How would u know vessel is dragging anchor

• Confirm vsl is within the turning circle
• Check position by radar(range bearing),GPS & UKC
• Course recorder indicates distorted curve rather than regular sine curve
• Regular swinging motion is topped & weather side becomes fixed
• D.log indicates ship is moving in certain direction with a speed of more than 1 knot
• Abnormal vibrations felt on the hull
• Relative positions to surrounding ships changes
• Taut cable condition continues