What does Course-up orientation indicate on a marine radar display?

What does Course-up orientation indicate on a marine radar display?

• A. The top shows true north at the top
• B. The top shows the vessel's heading and rotates with the ship
• C. The top shows the vessel's course over ground and rotates with the course
• D. The top is fixed and does not rotate

Answer: (C)

Course-up orientation uses the vessel’s course over ground as the reference direction, so the top of the radar display points in the direction the ship is actually moving over the ground and the image rotates as that course changes. This makes bearings on the screen align with your real track, including any drift from current or leeway, which is different from North-Up (top fixed to true north) or Heading-Up (top fixed to the vessel’s heading and rotates with the ship).

Course-up orientation uses the vessel’s course over ground as the reference direction, so the top of the radar display points in the direction the ship is actually moving over the ground and the image rotates as that course changes. This makes bearings on the screen align with your real track, including any drift from current or leeway, which is different from North-Up (top fixed to true north) or Heading-Up (top fixed to the vessel’s heading and rotates with the ship).