Originally Posted by bstreep
My uncle was a Navy
Oceanographer. He captained one of the Navy's cartography ships. I have a full set of Caribbean charts
, about half of which he personally surveyed (he signed the ones he did). BTW, his daughter is also an Annapolis-trained oceanographer, but she's soon to in command of a Carrier Air Wing...
Anyway, these charts
do NOT match GPS
coordinates without a proper correction. The fact is, the islands on the charts are all in the right place in relation to each other, but they are just not THAT accurate. Hundreds of feet, is close.
Somewhere along the border of the charts -in several places actually- will be edition dates...
Just curious about what they may be.
I have navigated off charts that said in the legend- "Based on Admiralty Surveys 1856" in the Caribbean
that were predicated off the position of Morro Castle in Havana as the starting point.
it wasn't until the mid -90s that the ref off Belize
was charted with data that wasn't from the 19th Century. There were all kinds of notes like, "reef reported lying 5nm east"...Kinda gets your attention with a 30 foot draft!
And, you can ask your daughter about this, there are still plenty of DNC charts sporting ancient hydrographic info.
BTW...Congrats on your daughter's selection as CAG!!!!