Worksheet 481 · Skill 5

Set and drift

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1. At 0945 your fix is 132°T, 1.6 nm from Gannet Rock daybeacon. You steer 349°T at 5.6 kn through the water. At 1045 a new fix puts you 030°T, 2.8 nm from Tern Island tower.

   Plot the 1045 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  

2. At 0755 your fix is 057°T, 1.9 nm from Gannet Rock daybeacon. You steer 223°T at 7.5 kn through the water. At 0835 a new fix puts you 212°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0835 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  

3. At 1025 your fix is 071°T, 2.4 nm from Gannet Rock daybeacon. You steer 215°T at 4.2 kn through the water. At 1055 a new fix puts you 014°T, 1.2 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1405 your fix is 062°T, 3.8 nm from Tern Island tower. You steer 216°T at 4.3 kn through the water. At 1530 a new fix puts you 049°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1530 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1400 your fix is 037°T, 4.5 nm from Gannet Rock daybeacon. You steer 241°T at 8.7 kn through the water. At 1440 a new fix puts you 205°T, 2.6 nm from Tern Island tower.

   Plot the 1440 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  

6. At 0750 your fix is 066°T, 2.1 nm from Westfield church spire. You steer 167°T at 4.2 kn through the water. At 0820 a new fix puts you 039°T, 2.8 nm from Heron Point Light.

   Plot the 0820 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 041°T, 1.0 nm from Gannet Rock daybeacon. You steer 152°T at 4.5 kn through the water. At 1105 a new fix puts you 045°T, 1.8 nm from Kittle water tank.

   Plot the 1105 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 0950 your fix is 232°T, 1.0 nm from Gannet Rock daybeacon. You steer 079°T at 5.2 kn through the water. At 1035 a new fix puts you 040°T, 2.5 nm from Kittle water tank.

   Plot the 1035 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn