Select the incorrectly spelt word from the given sentence.
An increasingly smart navigation aids in the cockpit brought far greater precision and effeciency to route planning.

Correct option is A

Option (a) is the incorrectly spelt word.
Correct spelling is: "Efficiency."
Meanings of all options:
Efficiency: The ability to accomplish a task with minimal effort.
Precision: The quality of being exact and accurate.
Navigation: The process of planning and controlling the course of a vessel.
Increasingly: More and more over time.