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Dear Dana, The only examples I come across regularly appear on British Admiralty charts, but only those published as of some time (sorry to be vague) around the last couple of decades of the 20th century. An exact date could be got from Guy Hannaford ([email protected]), the UKHO archivist who is extremely helpful. It is possible this is as a result of an International Hydrographic Organization standard. Here is an example: Before that date reliability indications as to survey data were loosely noted in the chart colophon, but only in terms of the date of the most recent survey and the ship and surveyors who did it. There was sometimes a reference to previous surveys where that data was incorporated in the new chart. Otherwise indications of reliability were given by convention - e.g. for vigias. In addition, for soundings (when individual soundings rather than depth contours were the norm) a different font was used (usually italic) to indicate soundings from previous charts of doubtful reliability. Hope that helps. Stephen D Dr Stephen Davies CSSC Maritime Heritage Research Fellow Hong Kong Maritime Museum g/f Murray House, Stanley Plaza, Stanley, Hong Kong SAR, China Tel: (+852) 2813 2322 Fax: (+852) 2813 8033 www.hkmaritimemuseum.org -------------------------------------------------- HKMM is moving to Central Pier 8 in 2012 ! 香港海事博物館將於2012年遷往中環八號碼頭! -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dana A. Freiburger Sent: 16 September 2011 01:10 To: Discussion group for map history Subject: [MapHist] Looking for a map with a specific kind of reliability diagram This is a MapHist list message (when you hit 'reply' you're replying to the whole list) o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o +
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