Worksheet 156 · Skill 5

Set and drift

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1. At 1550 your fix is 022°T, 1.6 nm from Tern Island tower. You steer 098°T at 8.8 kn through the water. At 1620 a new fix puts you 071°T, 4.1 nm from Tern Island tower.

   Plot the 1620 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  

2. At 1115 your fix is 040°T, 2.4 nm from Heron Point Light. You steer 012°T at 4.9 kn through the water. At 1210 a new fix puts you 287°T, 1.7 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0905 your fix is 048°T, 2.1 nm from Gannet Rock daybeacon. You steer 305°T at 4.5 kn through the water. At 0935 a new fix puts you 105°T, 1.5 nm from Tern Island tower.

   Plot the 0935 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 0815 your fix is 026°T, 2.2 nm from Gannet Rock daybeacon. You steer 175°T at 4.4 kn through the water. At 0855 a new fix puts you 145°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0855 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 1005 your fix is 257°T, 2.3 nm from Tern Island tower. You steer 249°T at 5.6 kn through the water. At 1040 a new fix puts you 089°T, 2.4 nm from Westfield church spire.

   Plot the 1040 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 0810 your fix is 259°T, 1.2 nm from Gannet Rock daybeacon. You steer 039°T at 4.8 kn through the water. At 0855 a new fix puts you 055°T, 2.8 nm from Tern Island tower.

   Plot the 0855 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  

7. At 0750 your fix is 070°T, 2.2 nm from Westfield church spire. You steer 105°T at 6.4 kn through the water. At 0845 a new fix puts you 222°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0845 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  

8. At 1450 your fix is 246°T, 3.6 nm from Tern Island tower. You steer 225°T at 4.6 kn through the water. At 1520 a new fix puts you 004°T, 1.8 nm from Heron Point Light.

   Plot the 1520 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