Worksheet 127 · Skill 5

Set and drift

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1. At 1015 your fix is 065°T, 1.0 nm from Gannet Rock daybeacon. You steer 050°T at 4.2 kn through the water. At 1055 a new fix puts you 044°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1055 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1155 your fix is 028°T, 2.5 nm from Kittle water tank. You steer 270°T at 5.6 kn through the water. At 1230 a new fix puts you 195°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1230 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1510 your fix is 075°T, 2.7 nm from Tern Island tower. You steer 176°T at 4.0 kn through the water. At 1550 a new fix puts you 096°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1550 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1540 your fix is 200°T, 1.3 nm from Gannet Rock daybeacon. You steer 264°T at 4.0 kn through the water. At 1700 a new fix puts you 062°T, 2.5 nm from Heron Point Light.

   Plot the 1700 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1520 your fix is 191°T, 1.5 nm from Gannet Rock daybeacon. You steer 084°T at 4.7 kn through the water. At 1555 a new fix puts you 015°T, 1.9 nm from Kittle water tank.

   Plot the 1555 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0700 your fix is 026°T, 2.1 nm from Heron Point Light. You steer 104°T at 6.6 kn through the water. At 0735 a new fix puts you 009°T, 2.3 nm from Mill stack.

   Plot the 0735 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1220 your fix is 032°T, 2.1 nm from Gannet Rock daybeacon. You steer 180°T at 4.4 kn through the water. At 1300 a new fix puts you 359°T, 1.5 nm from Kittle water tank.

   Plot the 1300 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1130 your fix is 043°T, 1.8 nm from Kittle water tank. You steer 283°T at 5.3 kn through the water. At 1230 a new fix puts you 006°T, 2.4 nm from Mill stack.

   Plot the 1230 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn