| Nanometer: |
A unit of measurement of light wavelength. A nanometer is one millionth of a millimeter. |
| Nautical mile: |
A unit of length used in sea and air navigation, based on the length of one minute of arc of a great circle, especially an international and U.S. unit equal to 1852 |
| Navigation: |
Plotting the most direct course to a given destination, flying the route as plotted and arriving at the destination within the stated time parameters. |
| Negative: |
The image produced on a photographic emulsion by the product of exposure and development, in which tones are reversed so that highlights appear dark and shadows appear light. |
| NiCad: |
Nickel cadmium battery. |
| Nimbostratus: |
A principal cloud type, gray colored, often dark, the appearance of which is rendered diffuse by more or less continuously falling rain or snow, which in most cases reaches the ground. |
| NiMH: |
Nickel metal hydride battery. Ecologically safe and very efficient. |
| Noise: |
Pixels on the image sensor that misread the light. |
| Noise reduction: |
When a slow shutter speed is used (1/30 sec. and lower), the image degrades due to the buildup of electronic signal ("noise"). Software in the digital camera automatically compensates to reduce that noise. What is important is a camera with noise reductio |
| Northern lights: |
Also known as the aurora borealis. The luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centered around the earth's magnetic poles. These incredable silent lightshows are often seen on clear winter nights in a varie |
| Nose gear: |
The landing gear nearest the nose of the aircraft; usually under the cockpit. |
| NOTAM: |
Stands For Notice to Airmen - A notice containing information concerning establishment, condition, or any component in the NAS of which the timely knowledge is essential to personnel concerned with flight operations. When the problem no longer exists, or |
| NOTAR: |
Stands for no tail rotor. A system patented by McDonnell Douglas for maintaining directional control of helicopters without use of an anti-torque tail rotor.
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| November: |
Stands for the letter N in the phonetic alphabet. |
| NTSC: |
A US video out standard to display images on a TV screen. |
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