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Flashcards in Mental Math Deck (54):
1

Time to travel 1 C at Speed of 3 Kts

120 seconds

2

Time to travel 1 C at Speed of 5 Kts

72 seconds

3

Time to travel 1 C at Speed of 6 Kts

60 seconds

4

Time to travel 1 C at Speed of 7 kts

51 seconds

5

Time to travel 1 C at Speed of 8 Kts

45 seconds

6

Time to travel 1 C at Speed of 9 Kts

40 seconds

7

Time to travel 1 C at Speed of 10 Kts

36 seconds

8

Time to travel 1 C at Speed of 11 Kts

33 seconds

9

Time to travel 1 C at Speed of 12 Kts

30 seconds

10

Time to travel 1C at Speed of 13 Kts

28 seconds

11

Time to travel 1 C at Speed of 14 Kts

26 seconds

12

Time to travel 1 C at Speed of 15 Kts

24 seconds

13

Time to travel 1 C at Speed of 18 Kts

20 seconds

14

Time to travel 1 C at Speed of 20 Kts

18 seconds

15

Time to travel 1 NM at Speed of 3 Kts

20 minutes

16

Time to travel 1 NM at Speed of 4 Kts

15 minutes

17

Time to travel 1 NM at Speed of 5 Kts

12 minutes

18

Time to travel 1 NM at Speed of 6 Kts

10 minutes

19

Time to travel 1 NM at Speed of 7 Kts

8.5 minutes

20

Time to travel 1 NM at Speed of 8 Kts

7.5 minutes

21

Time to travel 1 NM at Speed of 9 Kts

6.67 minutes

22

Time to travel 1 NM at Speed of 10 Kts

6 minutes

23

Time to travel 1 NM at Speed of 11 Kts

5.5 minutes

24

Time to travel 1 NM at Speed of 12 Kts

5 minutes

25

Time to travel 1 NM at Speed of 15 Kts

4 minutes

26

Time to travel 1 NM at Speed of 18 Kts

3.33 minutes

27

Time to travel 1 NM at Speed of 20 Kts

3 minutes

28

Q image thumb

SIN(θ) = CPA / DIST

           = 1 C / 10 C   = 1/10

      (6) = 1/10

 

         Steer in/out 6 Degrees

29

Q image thumb

SIN(θ) = CPA / DIST

           = 2 C / 10 C   = 1/5

    (12) = 1/5

 

         Steer in/out 12 Degrees

30

Q image thumb

SIN(θ) = CPA / DIST

           = 5 C / 10 C   = 1/2

   (30) = 1/2

 

         Steer in/out 30 Degrees

31

Q image thumb

SIN(θ) = CPA / DIST

           = 1 C / 20 C   = 1/20

      (3) = 1/20

 

         Steer in/out 3 Degrees

32

Q image thumb

SIN(θ) = CPA / DIST

           = 2 C / 20 C   = 1/10

      (6) = 1/10

 

         Steer in/out 6 Degrees

33

Q image thumb

SIN(θ) = CPA / DIST

           = 5 C / 20 C   = 1/4

    (15) = 1/4

 

         Steer in/out 15 Degrees

34

Q image thumb

SIN(θ) = CPA / DIST

           = 1 NM / 2 NM   = 1/2

      (30) = 1/2

 

         Steer in/out 30 Degrees

35

Q image thumb

SIN(θ) = CPA / DIST

           = 1 C / 30 C   = 1/30

      (2) = 1/30

 

         Steer in/out 2 Degrees

36

Q image thumb

SIN(θ) = CPA / DIST

           = 2 C / 30 C   = 1/15

      (4) = 1/15

 

         Steer in/out 4 Degrees

37

Q image thumb

SIN(θ) = CPA / DIST

           = 5 C / 30 C   = 1/6

      (10) = 1/6

 

         Steer in/out 10 Degrees

38

Q image thumb

SIN(θ) = CPA / DIST

           = 1 NM / 3 NM   = 1/3

   (20) = 1/3

 

         Steer in/out 20 Degrees

39

Q image thumb

SIN(θ) = CPA / DIST

           = 2 C / 40 C   = 1/20

      (3) = 1/20

 

         Steer in/out 3 Degrees

40

Q image thumb

SIN(θ) = CPA / DIST

           = 5 C / 40 C   = 1/8

      (8) = 1/8

 

         Steer in/out 8 Degrees

41

Q image thumb

SIN(θ) = CPA / DIST

           = 1 NM / 4 NM  = 1/4

    (15) = 1/4

 

         Steer in/out 15 Degrees

42

Q image thumb

SIN(θ) = CPA / DIST

           = 2 NM / 4 NM  = 1/2

   (30) = 1/2

 

         Steer in/out 30 Degrees

43

Q image thumb

SIN(θ) = CPA / DIST

           = 5 C / 50 C   = 1/10

      (6) = 1/10

 

         Steer in/out 6 Degrees

44

Q image thumb

SIN(θ) = CPA / DIST

           = 1 NM / 5 NM   = 1/5

    (12) = 1/5

 

         Steer in/out 12 Degrees

45

Q image thumb

SIN(θ) = CPA / DIST

           = 2 NM / 5 NM   = 2/5 = 0.4 (1/2.5)

                                SIN(20) = 1/3   SIN(θ) = 1/2.5   SIN(30) = 1/2

     (25) = 1/2.5

 

         Steer in/out 25 Degrees

46

Leadmark bears 3° high at 1 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                = 3° x 1 / 3

                                                                = 3 / 3     = 1

 

Port of Track (SM would be Starboard of Track)

100 Yards

47

Leadmark bears 10 degrees high at 2.5 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) /

                                                                 = 10° x 2.5 / 3

                                                                 = 25 / 3     = 8.1

 

Port of Track (SM would be Starboard of track)

810 Yards

48

Leadmark bears 5 degrees high at 2 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) /

                                                                 = 5° x 2 / 3

                                                                 = 10 / 3     = 3.3

 

Port of Track (SM would be Starboard of track)

330 Yards

49

Leadmark bears 10 degrees low at 3 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 8° x 3 / 3

                                                                 = 24 / 3     = 8

 

Starboard of Track (SM would be Port of track)

800 Yards

50

Leadmark bears 4 degrees low at 4 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 4° x 4 / 3

                                                                 = 16 / 3     = 5.3

 

Starboard of Track (SM would be Port of track)

530 Yards

51

Leadmark bears 7 degrees high at 2 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 7° x 2 / 3

                                                                 = 14 / 3     = 4.6

 

Port of Track (SM would be Starboard of track)

460 Yards

52

Leadmark bears 6 degrees low at 3 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 6° x 3 / 3

                                                                 = 18 / 3     = 6

 

Port of Track (SM would be Starboard of track)

600 Yards

53

Leadmark bears 2 degrees low at 3 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 2° x 3 / 3

                                                                 = 6 / 3     = 2

 

Starboard of Track (SM would be Port of track)

200 Yards

54

Leadmark bears 5 degrees high at 3 NM

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3

                                                                 = 5° x 3 / 3

                                                                 = 15 / 3     = 5

 

Port of Track (SM would be Starboard of track)

500 Yards