Making sure I’m understanding this correct. If you meet all other qualifications and hold a mate of towing for 6 months you can get your OICNW greater than 500 operational, correct ?
Most get their 1600 ton then apply, but it looks like to me you can get it with 6 months of service as a mate of towing.
Here is the CFR
11.309 Requirements to qualify for an STCW endorsement as Officer in charge of a navigational watch (OICNW) of vessels of 500 GT or more (operational level).
(a) To qualify for an STCW endorsement as OICNW, an applicant must—
(1) Provide evidence of seagoing service as follows:
(i) Thirty-six months of seagoing service in the deck department on vessels operating in oceans, near-coastal waters, and/or Great Lakes. Service on inland waters, bays, or sounds that are navigable waters of the United States may be substituted for up to 50 percent of the total required service; or
(ii) Twelve months of seagoing service as part of an approved training program, which includes onboard training that meets the requirements of Section A-II/1 of the STCW Code (incorporated by reference, see § 11.102 of this part);
(2) Provide evidence of having performed, during the required seagoing service, bridge watchkeeping duties under the supervision of an officer holding the STCW endorsement as master, chief mate, second mate, or OICNW, for a period of not less than 6 months;
(3) Provide evidence of meeting the standard of competence specified in Section A-II/1 of the STCW Code; and
(4) Provide evidence of having satisfactorily completed approved training in the following subject areas:
(i) Medical first-aid provider.
(ii) Radar observer.
(iii) Search and rescue.
(iv) Basic and advanced firefighting in accordance with § 11.303 of this subpart.
(v) Proficiency in survival craft and rescue boats other than fast rescue boats (PSC) or proficiency in survival craft and rescue boats other than lifeboats and fast rescue boats (PSC-limited).
(vi) Visual signaling.
(vii) Bridge resource management (BRM).
(viii) Terrestrial and celestial navigation, and electronic navigation systems.
(ix) Watchkeeping, including International Regulations for Preventing Collisions at Sea (COLREGS) and IMO standard marine communication phrases (SMCP).
(x) Cargo handling and stowage.
(xi) Ship handling.
(xii) Stability and ship construction.
(xiii) Meteorology.
(xiv) ARPA, if serving on a vessel with this equipment.
(xv) GMDSS, if serving on a vessel with this equipment.
(xvi) ECDIS, if serving on a vessel with this equipment.
(b) Experience gained in the engine department on vessels may be creditable for up to 3 months of the service requirements in paragraph (a)(1)(i) of this section.
(c) For a renewal of an STCW endorsement as OICNW of vessels of 500 GT or more to be valid on or after January 1, 2017, each candidate must provide the following:
(1) Evidence of meeting the standard of competence in leadership and teamworking skills.
(2) Completion of approved training in ECDIS, if serving on a vessel with this equipment.
(d) The Coast Guard may exempt an applicant from meeting any individual knowledge, understanding, and proficiency required in Section A-II/1 of the STCW Code. These exemptions must be approved by the Coast Guard based upon vessel type. Under these circumstances, the credential may include a corresponding limitation.
(e) Seafarers with one of the following national officer endorsements are eligible to apply for this endorsement upon completion of the requirements in the following table:
Table 1 to § 11.309(e)—STCW Endorsement as OICNW of Vessels of 500 GT or More
Entry path from national endorsements
Sea service under authority of the endorsement1
Competence—STCW Table A-II/12
Training required by thissection3
Mate ocean or near-coastal, unlimited tonnage
None
Yes
Yes.
Master ocean or near-coastal, less than 500 GRT
6 months
Yes
Yes.
Mate ocean or near-coastal, less than 1,600 GRT
None
Yes
Yes.
Mate ocean or near-coastal, less than 500 GRT
12 months
Yes
Yes.
Mate OSV
12 months1
Yes
Yes.
Mate towing vessel ocean or near-coastal
6 months
Yes
Yes.
1 This column provides the minimum additional service required of the seafarer in order to meet the requirements of this section.
2 Complete any items in paragraph (a)(3) of this section not previously satisfied.
3 Complete any items in paragraph (a)(4) of this section not previously satisfied.
[USCG-2004-17914, 78 FR 77909, Dec. 24, 2013, as amended by USCG-2014-0688, 79 FR 58276, Sept. 29, 2014; USCG-2018-0874, 84 FR 30882, June 28, 2019]
https://www.ecfr.gov/current/title-46/chapter-I/subchapter-B/part-11/subpart-C/section-11.309