15 - Time & Navigation

Question 1

International Date Line

Answer 1

• 180º
• Sun travels East to West
• M and Y timezones are 7.5º wide

Question 2

Prime Meridian

Answer 2

• Longitude 000º
• “Z” - Reference for all other timezones
• Timezones East of Prime Meridian (A-M)
  
  • All negative, with A = -1
  • No “J” - used to refer to local time
  • Add an hour for each timezone
• Timezones West of Prime Meridian (N-Y)
  
  • All positive, with N = +1
  • Subtract an hour for each timezone

Question 3

Info about Timezones

Answer 3

If it’s SUNday in San Diego, it’s MONday in Manila

• At timezones M and Y, add or subtract A DAY
• 1º = 4 min
• 1’ = 4 sec

Question 4

Date Time Group Format (DTG)

Answer 4

DDTTTTZMONYR

2030 GMT on the 26th of February 2018 in DTG format is:

262030ZFEB18

Question 5

Arc to Time Conversion

Answer 5

Time that it takes the sun to apparently traverse along a longitudinal distance

Question 6

Timezones East of Prime Meridian

Answer 6

Question 7

Timezones West of Prime Meridian

Answer 7