21. An applicant for license as master of ocean steam vessels shall be eligible for examination after he has furnished satisfactory documentary evidence to the local inspectors that he has had the following experience: _First._ One year's service as chief mate of ocean steam vessels, or _Second._ Two years' service as second mate of ocean steam vessels, one year of such service while holding a license as chief mate of ocean steam vessels, or _Third._ Two years' service as watch officer actually in charge of a bridge watch on ocean steam vessels, while holding a license as chief mate of ocean steam vessels, or _Fourth._ Five years' service as third mate of ocean steam vessels, two years of such service while holding a license as chief mate of ocean steam vessels, or _Fifth._ Five years' service on ocean sail vessels of 300 gross tons or over, two years of such service while holding a license as master of sail vessels, or _Sixth._ One year's service as master or chief mate of coastwise steam vessels. Examination for master of ocean steam vessels. 22. An applicant for license as master of ocean steam vessels shall pass a satisfactory examination as to his knowledge of the following subjects: 1. Latitude by meridian altitude of the sun. 2. Latitude by ex-meridian altitude of the sun. 3. Latitude by meridian altitude of a star. 4. Latitude by pole star. 5. Longitude by chronometer (A.M. and P.M.). 6. Position by Sumner's method. 7. Day's work. 8. Mercator's sailing. 9. Deviation of the compass by an amplitude. 10. Deviation of the compass by an azimuth. 11. Time of high water at a given port. 12. Chart navigation. 13. Storm signals. 14. International code of signals. 15. International rules for preventing collisions at sea. 16. Use of gun and rocket apparatus for saving life from shipwreck, as practiced by the United States Coast Guard. 17. Such further examination of a non-mathematical character as the local inspectors may require. Masters of coastwise steam vessels. 23. An applicant for license as master of coastwise steam vessels shall be eligible for examination after he has furnished satisfactory documentary evidence to the local inspectors that he has had the following experience: _First._ One year's service as chief mate of ocean or coastwise steam vessels, or _Second._ Two years' service as second mate of ocean or coastwise steam vessels, one year of such service while holding a license as chief mate of ocean or coastwise steam vessels, or _Third._ Five years' service as third mate of ocean or coastwise steam vessels, two years of such service while holding a license as chief mate of ocean or coastwise steam vessels, or