Citizen JNOXXX Zero positioning can also be done in Chronograph mode, Knots air speed

*Zero positioning can also be done in Chronograph mode.

1.Press the
M (MODE) button to align the mode hand to [CHR].

2.Press the
M (MODE) button to its outward position.

3.The digital segments change in the sequence of UTC ➡ HR ➡ MIN each time the
B button is pressed.

UTC: For zero positioning of the UTC time display

HR: For zero positioning of the hour hand and the 24-hour hand

MIN: For zero positioning of the minute hand

4.Pressing the
A (UP) button turns each hand clockwise. Pressing the
C (DOWN) button turns each hand counterclockwise. Align all hands to the 12 o’clock position.

5.When the
A (UP) button is pushed back in to this normal position, the watch beeps and at the same time the hands start moving. Zero positioning is now completed.

6.Set the time, calendar and other modes.

Using the Register Ring

[Calculation function] Note the following points when using this function. Use the calculation function of this watch only

as a guide. Scales like these cannot, place a decimal point for you.

A. Navigational calculation

1.Time required

Example: Obtain the time required for the flight of an aircraft at 180 knots for 450 nautical miles. Answer: Align “18” on the outer scale with the SPEED INDEX (▲) on the inner scale. Then, “45” on the outer scale corresponds to “2:30” on the inner scale (time scale). Thus, the time required for the flight is 2 hours and 30 minutes.

2.Knots (air speed)

Example: Obtain the knots (air speed) for 240 nautical miles with a flight time of 1 hour and 20 minutes.

Answer: Align “24” on the outer scale with “1:20” on the inner scale (time scale). Then, the SPEED INDEX (▲) on the inner scale corresponds to “18” on the outer scale. Thus, the air speed for the flight is 180 knots.

3.Flight distance

Example: Obtain the air distance when the air speed is 210 knots and the flight time is 40 minutes. Answer: Align “21” on the outer scale with the SPEED INDEX (▲) on the inner scale. Thus, the air distance of the flight is 140 nautical miles.

4.Rate of fuel consumption

Example: Obtain the rate of fuel consumption (gallons/hour) when the flight time is 30 minutes and the fuel consumption is 120 gallons.

Answer: Align “12” on the outer scale with the “30” on the inner scale. Then, the SPEED INDEX (▲) on the inner scale corresponds to “24” on the outer scale. Thus, the fuel consumption is 240 gallons per hour.

5.Fuel Consumption

Example: Obtain the fuel consumption required for a flight when the fuel consumption is 250 gallons per hour and the flight time is 6 hours.

Answer: Align “25” on the outer scale with the SPEED INDEX (▲) on the inner scale. Then, “6:00” on the inner scale (time scale) corresponds to “15” on the outer scale. Thus, the fuel consumption is 1,500 gallons.

6.Estimated flight time

Example: Obtain the estimated flight time when the fuel consumption is 220 gallons per hour and the aircraft has 550 gallons of fuel.

Answer: Align “22” on the outer scale with the SPEED INDEX (▲) on the inner scale. Then, “55” on the outer scale corresponds to “2:30” on the inner scale (time scale). Thus, the estimated flight time is 2 hours and 30 minutes.

7.Differences in altitude

The difference in altitude can be obtained from the rate of descent and the descent time.

Example: Obtain the difference in altitude when an aircraft continues descending for 23 minutes at a rate of 250 feet per minute.

Answer: Align “25” on the outer scale with “10” on the inner scale. Then, “23” on the inner scale corresponds to “57.5” on the outer scale. Thus, the difference in altitude is 5,750 feet.

8.Rate of climb (or descent)

The rate of climb (or descent) can be obtained from the time required to reach an altitude. Example: Obtain the rate of climb when an aircraft reaches an altitude of 7,500 feet after climbing for 16 minutes.

Answer: Align “75” on the outer scale with the “16” on the inner scale. Then, “10” on the inner scale corresponds to “47” on the outer scale. Thus, the rate of the climb is 470 feet.

9.Time of climb (or descent)

The time required for climb can be obtained from the altitude to be reached and the rate of climb (or descent)

Example: Obtain the time of climb when an aircraft is to climb to 6,300 feet at a rate 550 feet per minute. Answer: Align “55” on the outer scale with “10” on the inner scale. Then, “63” on the outer scale corresponds to “11.5” on the inner scale. Thus, the time of climb is 11 minutes and 30 seconds.