Worksheet 870 · Skill 5

Set and drift

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1. At 0955 your fix is 346°T, 1.6 nm from Kittle water tank. You steer 001°T at 5.0 kn through the water. At 1030 a new fix puts you 105°T, 1.7 nm from Tern Island tower.

   Plot the 1030 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 1230 your fix is 060°T, 2.1 nm from Heron Point Light. You steer 037°T at 6.5 kn through the water. At 1300 a new fix puts you 281°T, 1.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1025 your fix is 063°T, 2.8 nm from Gannet Rock daybeacon. You steer 358°T at 6.6 kn through the water. At 1055 a new fix puts you 072°T, 3.8 nm from Tern Island tower.

   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 1050 your fix is 232°T, 2.8 nm from Tern Island tower. You steer 093°T at 6.2 kn through the water. At 1130 a new fix puts you 358°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1130 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 0800 your fix is 024°T, 1.7 nm from Heron Point Light. You steer 041°T at 7.6 kn through the water. At 0840 a new fix puts you 315°T, 2.5 nm from Tern Island tower.

   Plot the 0840 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 1525 your fix is 067°T, 5.1 nm from Tern Island tower. You steer 208°T at 7.6 kn through the water. At 1555 a new fix puts you 030°T, 2.6 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1050 your fix is 005°T, 1.9 nm from Mill stack. You steer 047°T at 5.4 kn through the water. At 1135 a new fix puts you 000°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

8. At 1100 your fix is 205°T, 2.2 nm from Tern Island tower. You steer 274°T at 6.7 kn through the water. At 1150 a new fix puts you 083°T, 1.0 nm from Westfield church spire.

   Plot the 1150 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