(a) An applicant for a flight navigator certificate must be a graduate
of a flight navigator course approved by the Administrator or present
satisfactory documentary evidence of --
(1) Satisfactory determination of his position in flight at least 25
times by night by celestial observations and at least 25 times by day by
celestial observations in conjunction with other aids; and
(2) At least 200 hours of satisfactory flight navigation including
celestial and radio navigation and dead reckoning.
A pilot who has logged 500 hours of cross-country flight time, of which
at least 100 hours were at night, may be credited with not more than 100
hours for the purposes of paragraph (a)(2) of this section.
(b) Flight time used exclusively for practicing long-range navigation
methods, with emphasis on celestial navigation and dead reckoning, is
considered to be satisfactory navigation experience for the purposes of
paragraph (a) of this section. It must be substantiated by a logbook, by
records of an armed force or a certificated air carrier, or by a letter
signed by a certificated flight navigator and attached to the application.