International Navigation Rules: rules 37 & 38

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Links to get the rulebook

https://www.amazon.com/Navigation-Rules-Regulations-Handbook-Updated/dp/1937196232/ref=mp_s_a_1_1?keywords=navigation+rules&qid=1555202231&s=gateway&sr=8-1

https://m.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m4084.l1313.TR12.TRC2.A0.H0.Xnavigation+r.TRS0&_nkw=navigation+rules