[Public-List] old charts

[Michael via Public-List]

That's interesting the Canadian Gov't has such a different approach that 
the U.S.
U.S. Charts are not copyrighted, any program that handles .bsb format 
can update electronically from the NOAA website-although I will grant 
you finding the actual file to download is a job in itself.
Anyway, I'm using Mariner MX on my Android smartphone-it's not a full 
fledged plotter (I've used Nobeltec, Maptech, Navnet, and currently 
Rosepoint. I don't like the Garmin and Simrad units that use 
chips-raster or vector, I forget which is which, they look like cartoons 
on the screen, although they do the job and probably less battery drain) 
but Mariner is a pretty handy app, especially being free.
The bottom left hand corner of paper charts is where corrected to date 
lives. In the U.S I don't think you can get correction info except for 
the latest edition chart. I suppose if you kept up with it every week 
(from Notice to Mariners) old charts would be acceptable. I'm not seeing 
recreational boaters doing that. Charts that are rendered unfit for 
navigation have that corner cut out.
My company's using Ocean marine Services (in Easton, MD.!) they make a 
cut and paste product for paper chart correcting that's pretty 
handy-especially if you have 87 charts to correct every week. New 
edition comes out, old chart gets tossed, even though it is corrected up 
to date-date of correction noted in margin. I get a lot of crab paper.
MichaelGrosh
#220

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