[image] How accurate are nautical charts? Charts will provide more information on “zone of confidence” It is a major challenge – some might say an impossibility – to keep all thousand U.S. nautical charts up to date. But exactly how out of… Sometimes, partic…

Australian charts are all printed with ZOC tables and we have been using them for many years. I’m surprised that this is new in some places. We have huge areas that are either unsurveyed or inadequately surveyed largely because the imperative has not been there for either the safety of ships passa…

Vokeo Island off the North coast of PNG was known in Wewak as “Walkabout Island”. If you took a bearing of it from the anchorage in the morning and again in the afternoon, when the 3 o’clock rainstorm had cleared, the difference was several degrees. In the late 1960s it was marked on the charts wi…

Who produces nautical charts and who funds them?

Is that a trick question? The positions of quite a few small islands off the west coast of Mexico are way off. Probably not surveyed since the rule of conquistadors.

Nope, not a trick question. Just asking why people run into things if they travel in uncharted waters and then compliain. If the waters are not charted why go ? If one runs into something, whose fault?

According to NOAA, only about five percent of the global ocean has been mapped by modern multibeam sonar systems to provide detailed information about the seafloor.

[image] tengineer1: If the waters are not charted why go ? All waters were once uncharted. Why go? Sounds like you’ve spent your seagoing career plodding along well established sea routes which attract better surveys, made safe by someone or many going before you. And there’s a difference …

Went up to Istanbul in the early 90’s Current UK chart was surveyed in 1890 something We used the same chart as used in WW1 lol The bottom/southern part of the Gallipoli Peninsula said its 5nm north of where marked on the chart. GPS useless in these areas, its puts you on the land.

[image] Jughead: All waters were once uncharted. Why go? Sounds like you’ve spent your seagoing career plodding along well established sea routes which attract better surveys, made safe by someone or many going before you. Actually, I was thinking about the US Navy’s propensity for running in…

How accurate are nautical charts?

Professional Mariner Forum

Tom_Tugboat November 7, 2021, 6:16pm 9

Update: USS Connecticut Hit Uncharted Underwater Seamount

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How accurate are nautical charts?

Update: USS Connecticut Hit Uncharted Underwater Seamount

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