_Fourth._ One year's service as master of lake, bay, or sound steam vessels and in addition thereto one year's service as second mate, third mate, quartermaster or wheelsman on ocean or coastwise steam vessels while holding a license as master of lake, bay, or sound steam vessels, or _Fifth._ Five years' service on ocean or coastwise sail vessels of 300 gross tons or over, two years of which service shall have been as master, or _Sixth._ One year's service as a licensed master of ocean or coastwise sail vessels of 700 gross tons or over, or _Seventh._ Two years' service as master of lake, bay, or sound towing steam vessels for license as master of coastwise towing steam vessels of 300 gross tons or under. In cases where the experience of an applicant for license as master of coastwise steam vessels does not meet the specific requirements of this section, other service which the local inspectors consider a fair and reasonable equivalent may be accepted by them in lieu of the service herein specified. Examination for master of coastwise steam vessels. 24. An applicant for license as master of coastwise steam vessels on routes exceeding 300 miles shall pass a satisfactory examination as to his knowledge of the following subjects: 1. Latitude by meridian altitude of the sun. 2. Latitude by pole star. 3. Day's work. 4. Determination of distance from a fixed object. 5. Chart navigation. 6. International rules for preventing collisions at sea. 7. Storm signals. 8. Use of gun and rocket apparatus for saving life from shipwreck, as practiced by the United States Coast Guard. 9. Such further examination of a non-mathematical character as the local inspectors may require. An applicant for license as master of coastwise steam vessels on route not exceeding 300 miles shall pass a satisfactory examination as to his knowledge of the following subjects: 1. Chart navigation. 2. Aids to navigation on route. 3. Determination of distance from a fixed object. 4. International rules for preventing collisions at sea. 5. Storm signals. 6. Such further examination of a non-mathematical character as the local inspectors may require Masters of sail vessels. 25. An applicant for license as master of sail vessels of over 700 gross tons shall be eligible for examination after he has furnished satisfactory documentary evidence to the local inspectors that he has had the following experience: _First._ Five years' service in the deck department of sail vessels of 200 gross tons or over, one year of such service shall have been as master of sail vessels of 500 gross tons or over, or _Second._ Two years' service as master of sail vessels of 200 gross tons or over, or _Third._ Two years' service as mate of sail vessels of 500 gross tons or over, or _Fourth._ Two years' service as master of auxiliary sail vessels of 100 gross tons or over.