Once known as Hartley18
Join Date: Aug 2007
Location: Melbourne, Australia
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Re: Great Lakes Boaters, Polyconic charts, mph
The OP is correct; on a polyconic or conic chart distances are measured with a distance scale, not the latitude scale. The distance scale on both charts is statute and some of the cautionary notes notes indicate m.p.h., not knots.
Righto.. What's this then?? Looks like nautical miles (and tenths) to me:
I understand that the Polyconic nature of the chart means that lines of lattitude and longtitude aren't necessarily straight up that part of the world, so don't get me wrong, I'm happy to learn something new.
Over here anyways, it's only a "chart" if it's in NM - otherwise it's a "map".
A bad day on a boat beats a good day in the office
Last edited by Classic30; 10-04-2012 at 12:44 AM.