I've always been a stickler on the sea time for my crew members and for myself. I always used 8 hours or more underway as a day at sea, as this is what the CFR's when I got my original license (1990). Then at some point they started taking 4-8 hrs, as relayed to me during a renewal when I did not have enough sea time for recency, still "underway" Lately I have been doing research on the subject and can not find any where in the CFR''s that say you have to be underway, even under the definition of a day in the CFR's. I have many friends in the gulf on the oil boats and they get the sea time from when they get aboard until they get off, regardless of being at sea or the dock. I have always been short of days for my renewal, even though I am on a pretty busy boat, but if I went by the definitions of a day in the CFR's I would have no problem. 46CFR10.107 Defenitions Day means, for the purpose of complying with the service requirements of this subchapter, eight hours of watchstanding or day-working not to include overtime. On vessels where a 12-hour working day is authorized and practiced, each work day may be creditable as one and one-half days of service. On vessels of less than 100 gross register tons, a day is considered as eight hours unless the Coast Guard determines that the vessel's operating schedule makes this criteria inappropriate, in no case will this period be less than four hours. When computing service required for MODU endorsements, a day is a minimum of four hours, and no additional credit is received for periods served over eight hours. From previous posts I know there are others on here that are really good with the CFR's can you find any where that it says "underway"? It can be found in USCG doc's, but we called the licensing department and they said yes underway, but could not site the CFR.