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Navigation aid: A device or process to help with navigation, such as a VOR station or a position update.

Navigation Reference Point: A point, usually fixed in earth coordinates but possibly moving; also, a basic guidance mode, providing lateral guidance to an NRP, either by course or by direct point.

Navigation: A system, usually software, in which the primary purpose is to generate position relative to a coordinate frame, usually fixed earth frame, such as latitude and longitude or UTM.

Negligence: Failure to exercise reasonable care to avoid injuring others or their property. Negligence includes both actions and failure to act. 

Noise: Part of received data that is undesired, consisting of random sinusoidal terms added to a signal. 

Non-Refundable: No money is returned should the trip be cancelled. The amount of the ticket, minus a service fee, may be applied to another trip in many cases. 

Normalizer: Function to restrict input to a specific range; normalized variables often present problems for filters and other functions at their discontinuities.

Nuisance: An unreasonable or unlawful use of one’s real estate that results in injures to another or interferes with another person’s use of his real property.