Worksheet 675 · Skill 5

Set and drift

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1. At 0915 your fix is 177°T, 1.0 nm from Gannet Rock daybeacon. You steer 026°T at 5.1 kn through the water. At 1015 a new fix puts you 060°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1015 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 1245 your fix is 028°T, 1.6 nm from Tern Island tower. You steer 128°T at 4.2 kn through the water. At 1320 a new fix puts you 033°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1320 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 1530 your fix is 157°T, 1.4 nm from Westfield church spire. You steer 108°T at 8.3 kn through the water. At 1600 a new fix puts you 349°T, 2.3 nm from Mill stack.

   Plot the 1600 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 1130 your fix is 010°T, 1.1 nm from Gannet Rock daybeacon. You steer 035°T at 5.7 kn through the water. At 1210 a new fix puts you 052°T, 4.2 nm from Tern Island tower.

   Plot the 1210 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  

5. At 1330 your fix is 231°T, 2.4 nm from Tern Island tower. You steer 319°T at 6.0 kn through the water. At 1420 a new fix puts you 042°T, 3.8 nm from Westfield church spire.

   Plot the 1420 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 1455 your fix is 223°T, 3.5 nm from Tern Island tower. You steer 195°T at 4.5 kn through the water. At 1530 a new fix puts you 002°T, 1.4 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 345°T, 1.5 nm from Heron Point Light. You steer 087°T at 5.5 kn through the water. At 1510 a new fix puts you 066°T, 2.5 nm from Mill stack.

   Plot the 1510 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1155 your fix is 241°T, 2.0 nm from Tern Island tower. You steer 246°T at 4.0 kn through the water. At 1250 a new fix puts you 053°T, 1.3 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn