Originally Posted by zeehag
What is considered to be an updated chart? Is it 1865, or have charts been updated since then? Or is it the mess we make on them is considered updating?
An updated chart is a "current" (within 1 year) edition.
Charts have been constantly updated since the original ninteenth century surveys.
The mess we make on them is also considered updating.
vs Edition dates:
The mandate to create nautical charts of the American coasts dates back to 1807, when U.S. President Thomas Jefferson ordered a survey
of the nation's coast. The Organic Act of 1807 authorized the newly formed coastal survey agency, then called the U.S. Coast Survey, to construct and maintain the nation's nautical charts.
charts are based upon these original nineteenth century surveys, but have been constantly updated.
Any paper chart that has an edition date, one year prior to the purchase
date, is quite likely to have had important new changes affecting the chart published in the USCG LNM, NGA NM, or the Canadian Coast Guard NM. It is imperative that these changes be applied to the chart so the chart can be brought up to date.
Mariners using traditional paper charts apply chart corrections manually by using pencils, erasers, rulers, compasses, dividers, and protractors. Applying updates to a suite of paper charts can be time consuming, tedious, and error prone.
Accordingly, NOAA has developed a paper product that addresses the problem of manual updates to paper charts. A Print on Demand (POD) chart is a “current edition” paper chart, that is printed at the time of purchase
; and contains chart updates accurate up until the time of purchase.