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Subject: Re: MAPS-L: Chart No. 1 - USA Nautical chart Symbols &
abbreviations
Date: Thurs, 28 Jul 2005
From: Jon McConnel <[log in to unmask]>
Reply-To: Jon McConnel <[log in to unmask]>
To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]>
References: <[log in to unmask]>

Kathy,

If you keep editions of charts from a particular time period, it is
probably a good idea to also keep a selection of the key to the chart.

There have been a number of changes to symbolization in this chart
series since the early 1970's, due in large part to efforts by the
International Hydrographic Organization to standardize nautical chart
symbols worldwide. They had been working on it since the early 1920's
but really kicked it into gear around 1980.

Also, the numbering system of the NOAA/Coast & Geodtic Survey nautical
charts was completely redone in (I believe 1974) to fit the charts
into the worldwide chart numbering system of the DMA.

So, if you have any charts from between 1940-something, when Chart No.
1 was first published, and 1974, it would be a good idea to keep
around a copy of Chart No. 1 from that era so any changes to chart
symbols could be definitively understood. If you don't keep superseded
charts there is little reason to.

-Jon McConnel
UOregon Geog. Grad student (working with historic US C&GS nautical charts)
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