Worksheet 138 · Skill 5

Set and drift

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1. At 1105 your fix is 060°T, 4.4 nm from Tern Island tower. You steer 222°T at 5.7 kn through the water. At 1140 a new fix puts you 011°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1140 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  

2. At 1210 your fix is 061°T, 4.8 nm from Tern Island tower. You steer 185°T at 7.0 kn through the water. At 1250 a new fix puts you 035°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1250 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 1205 your fix is 034°T, 1.4 nm from Westfield church spire. You steer 130°T at 4.7 kn through the water. At 1310 a new fix puts you 246°T, 3.2 nm from Tern Island tower.

   Plot the 1310 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0805 your fix is 258°T, 2.3 nm from Tern Island tower. You steer 162°T at 4.4 kn through the water. At 0835 a new fix puts you 206°T, 2.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0830 your fix is 079°T, 2.9 nm from Gannet Rock daybeacon. You steer 282°T at 5.4 kn through the water. At 0920 a new fix puts you 010°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0920 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0820 your fix is 330°T, 2.3 nm from Mill stack. You steer 353°T at 4.3 kn through the water. At 0900 a new fix puts you 092°T, 3.6 nm from Westfield church spire.

   Plot the 0900 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  

7. At 1045 your fix is 224°T, 2.5 nm from Gannet Rock daybeacon. You steer 312°T at 4.7 kn through the water. At 1115 a new fix puts you 262°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1115 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  

8. At 0735 your fix is 023°T, 1.6 nm from Westfield church spire. You steer 076°T at 4.7 kn through the water. At 0815 a new fix puts you 282°T, 3.8 nm from Tern Island tower.

   Plot the 0815 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