NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Slip answers
From: Herbert Prinz
Date: 2003 Apr 25, 14:36 +0000
From: Herbert Prinz
Date: 2003 Apr 25, 14:36 +0000
Hello Doug, I once used a measured mile for a speed check in the Long Island Sound (near Greenwich Harbor, if I remember correctly) and another one somewhere on the East Coast on my way up to Maine. In neither case did I have to convert from statute miles. I am pretty sure I remember this correctly, since I strictly refuse to know what a statute mile is. (For religious reasons. I was raised metric.) My charts are on the boat, so I can't check now. Maybe somebody else on the list happens to know these mile markers near Greenwich, or other ones. In the USA, Statute miles are unfortunately used on inland waters, which include not only all lakes and rivers but also the Intracoastal Waterways. Could it be that the test question in the examination was set in that scenario? I would also be curious to learn whether these measured courses are still being used in actual practice, or whether they have been replaced by using differential GPS. I can imagine that calibration of any instrument out at sea by means of GPS, particularly since SA is off, is nowadays the more accurate method, as the effects disturbing the measurement which are resulting from the vicinity of the shore would be eliminated. Herbert Prinz "Royer, Doug" wrote: > I do know that in the states the timed mile markers that are along shore for > checking speed are in statute miles and that is what the examiner was > looking for.I calculated 351.7 mi.(nautical mi.)and got it wrong.That's all > I can tall you on that.