Mental Math Flashcards
Time to travel 1 C at Speed of 3 Kts
120 seconds
Time to travel 1 C at Speed of 5 Kts
72 seconds
Time to travel 1 C at Speed of 6 Kts
60 seconds
Time to travel 1 C at Speed of 7 kts
51 seconds
Time to travel 1 C at Speed of 8 Kts
45 seconds
Time to travel 1 C at Speed of 9 Kts
40 seconds
Time to travel 1 C at Speed of 10 Kts
36 seconds
Time to travel 1 C at Speed of 11 Kts
33 seconds
Time to travel 1 C at Speed of 12 Kts
30 seconds
Time to travel 1C at Speed of 13 Kts
28 seconds
Time to travel 1 C at Speed of 14 Kts
26 seconds
Time to travel 1 C at Speed of 15 Kts
24 seconds
Time to travel 1 C at Speed of 18 Kts
20 seconds
Time to travel 1 C at Speed of 20 Kts
18 seconds
Time to travel 1 NM at Speed of 3 Kts
20 minutes
Time to travel 1 NM at Speed of 4 Kts
15 minutes
Time to travel 1 NM at Speed of 5 Kts
12 minutes
Time to travel 1 NM at Speed of 6 Kts
10 minutes
Time to travel 1 NM at Speed of 7 Kts
8.5 minutes
Time to travel 1 NM at Speed of 8 Kts
7.5 minutes
Time to travel 1 NM at Speed of 9 Kts
6.67 minutes
Time to travel 1 NM at Speed of 10 Kts
6 minutes
Time to travel 1 NM at Speed of 11 Kts
5.5 minutes
Time to travel 1 NM at Speed of 12 Kts
5 minutes
Time to travel 1 NM at Speed of 15 Kts
4 minutes
Time to travel 1 NM at Speed of 18 Kts
3.33 minutes
Time to travel 1 NM at Speed of 20 Kts
3 minutes

SIN(θ) = CPA / DIST
= 1 C / 10 C = 1/10
(6) = 1/10
Steer in/out 6 Degrees

SIN(θ) = CPA / DIST
= 2 C / 10 C = 1/5
(12) = 1/5
Steer in/out 12 Degrees

SIN(θ) = CPA / DIST
= 5 C / 10 C = 1/2
(30) = 1/2
Steer in/out 30 Degrees

SIN(θ) = CPA / DIST
= 1 C / 20 C = 1/20
(3) = 1/20
Steer in/out 3 Degrees

SIN(θ) = CPA / DIST
= 2 C / 20 C = 1/10
(6) = 1/10
Steer in/out 6 Degrees

SIN(θ) = CPA / DIST
= 5 C / 20 C = 1/4
(15) = 1/4
Steer in/out 15 Degrees

SIN(θ) = CPA / DIST
= 1 NM / 2 NM = 1/2
(30) = 1/2
Steer in/out 30 Degrees

SIN(θ) = CPA / DIST
= 1 C / 30 C = 1/30
(2) = 1/30
Steer in/out 2 Degrees

SIN(θ) = CPA / DIST
= 2 C / 30 C = 1/15
(4) = 1/15
Steer in/out 4 Degrees

SIN(θ) = CPA / DIST
= 5 C / 30 C = 1/6
(10) = 1/6
Steer in/out 10 Degrees

SIN(θ) = CPA / DIST
= 1 NM / 3 NM = 1/3
(20) = 1/3
Steer in/out 20 Degrees

SIN(θ) = CPA / DIST
= 2 C / 40 C = 1/20
(3) = 1/20
Steer in/out 3 Degrees

SIN(θ) = CPA / DIST
= 5 C / 40 C = 1/8
(8) = 1/8
Steer in/out 8 Degrees

SIN(θ) = CPA / DIST
= 1 NM / 4 NM = 1/4
(15) = 1/4
Steer in/out 15 Degrees

SIN(θ) = CPA / DIST
= 2 NM / 4 NM = 1/2
(30) = 1/2
Steer in/out 30 Degrees

SIN(θ) = CPA / DIST
= 5 C / 50 C = 1/10
(6) = 1/10
Steer in/out 6 Degrees

SIN(θ) = CPA / DIST
= 1 NM / 5 NM = 1/5
(12) = 1/5
Steer in/out 12 Degrees

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
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
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
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
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
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
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
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
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
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