Worksheet 355 · Skill 5

Set and drift

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1. At 0920 your fix is 240°T, 3.2 nm from Tern Island tower. You steer 094°T at 6.3 kn through the water. At 1025 a new fix puts you 056°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

2. At 1205 your fix is 277°T, 3.6 nm from Tern Island tower. You steer 071°T at 6.2 kn through the water. At 1250 a new fix puts you 009°T, 1.6 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0955 your fix is 098°T, 1.4 nm from Heron Point Light. You steer 341°T at 4.2 kn through the water. At 1125 a new fix puts you 072°T, 2.8 nm from Westfield church spire.

   Plot the 1125 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1210 your fix is 169°T, 1.3 nm from Tern Island tower. You steer 079°T at 5.0 kn through the water. At 1245 a new fix puts you 076°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1245 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  

5. At 1550 your fix is 085°T, 2.4 nm from Westfield church spire. You steer 297°T at 4.7 kn through the water. At 1625 a new fix puts you 012°T, 1.4 nm from Westfield church spire.

   Plot the 1625 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 0935 your fix is 313°T, 2.0 nm from Tern Island tower. You steer 263°T at 6.6 kn through the water. At 1010 a new fix puts you 040°T, 2.6 nm from Westfield church spire.

   Plot the 1010 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 0955 your fix is 009°T, 2.8 nm from Mill stack. You steer 099°T at 4.1 kn through the water. At 1100 a new fix puts you 216°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1100 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  

8. At 0925 your fix is 269°T, 3.2 nm from Tern Island tower. You steer 286°T at 4.0 kn through the water. At 1005 a new fix puts you 029°T, 2.7 nm from Westfield church spire.

   Plot the 1005 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