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Subject: Re: TWL: New Electronic Charts
From: Peter Bennett (peterbb@XXX.XXX)
Date: Thu Jan 02 2003 - 23:58:18 EST
Thursday, January 2, 2003, 5:29:45 AM, GYMKIDD319 wrote:
> NOS and NOAA signed an agreement last year to develop new electronic
> navigation charts (ENC's).
> I wrote the following to the NOAA project contact. If any listoids know
> what's going on, feel free to comment. If not, I'll post any reply to TWL. (I
> believe C-MAP claims their charts are currently used aboard USCG vessels.)
> "Mike,
> Can you briefly tell me in layman's terms how S-57 ENC's will differ from
> todays electronic charts, such a C-MAP? What's different that would permit
> them to be used in lieu of paper charts for S0LAS regulated vessels?"
The BSB format charts that most small craft chart programs use are
called "raster charts" and are simply a picture of a paper chart.
This makes it difficult to update them, or to add extra information.
The S-57 Electronic Navigation Charts (ENC) are "vector charts" - they
are a database that tells the display program how to draw the chart.
Because of the database format, extra information can be easily added,
and corrections made. Also, unlike BSB charts, when you zoom back,
lettering can remain legible, and the user can turn unwanted "layers"
of information off or on as desired.
A search at http://www.google.com for "S-57 nautical charts" will give
you several hundred references.
-- Peter Bennett, VE7CEI Vancouver, B.C., Canada GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver-webpages.com/van-ps _______________________________________________ http://lists.samurai.com/mailman/listinfo/trawler-world-list
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