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Old 01-02-2012, 09:51   #61
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Re: Navigation Trouble

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Originally Posted by bstreep View Post
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!!!!
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Old 01-02-2012, 10:01   #62
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Re: Navigation Trouble

Not my daughter, but my first cousin - HIS daughter. She is currently Deputy CAG, and is supposed to take command sometime this year:

I Like The Cut Of His Jib !!: Where is she now? Captain Sara Joyner - Deputy Commander Air Wing THREE

I'll see if I can remember to take a look at the charts next time we are on the boat.
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Old 01-02-2012, 10:14   #63
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Re: Navigation Trouble

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Not my daughter, but my first cousin - HIS daughter. She is currently Deputy CAG, and is supposed to take command sometime this year:

I Like The Cut Of His Jib !!: Where is she now? Captain Sara Joyner - Deputy Commander Air Wing THREE

I'll see if I can remember to take a look at the charts next time we are on the boat.
Actually I already knew that! Wasn't connecting the dots....Just misread your relationship.

And I think that you would agree that to get to the rank your niece is ...same rank and from the same world as the skipper of the La Moure County...that fools have long been filtered out.

Which brings up the point I have been repeatedly ridiculed for....

Until these accidents happen, nobody sees these folks as idiots and fools.

Unless you stay connected to the basics...You too can end up on the rocks one day.
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Old 01-02-2012, 10:50   #64
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Re: Navigation Trouble

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Originally Posted by sidmon View Post
Which brings up the point I have been repeatedly ridiculed for....

Until these accidents happen, nobody sees these folks as idiots and fools.

Unless you stay connected to the basics...You too can end up on the rocks one day.
Bingo. My uncle was forced into retirement because a fire broke out on his ship - while he was on leave.

Once you get to the rank of Captain or Full Colonel, you are usually considered "Admiral" or "General" material - by then, the "idiots and fools" are long gone.
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Old 01-02-2012, 11:10   #65
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Re: Navigation Trouble

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Originally Posted by bcaldoc View Post
Anyone having navigation trouble in Florida? We are cruising west on the Okeechobee Waterway and our brand new Garmin GPS is 200 ft off! Is this a fault in the GPS, or is this something to do with the solar storm? Any ideas?
Just curious bc...

Did you have a clear horizon when this anomaly occrred?

Is it still happening?

Do you know how to check the DLOP?
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Old 01-02-2012, 11:18   #66
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Re: Navigation Trouble

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Originally Posted by goboatingnow View Post
Don't think Garmin is relicensed, I beleive they are modified transas charts. Also Garmin have their own cartography group, which can create charts as well.

Dave
They do not go out and get their own data and create unique charts.

They "value add" under their brand with satellite imagery, differeing 3D projections, colors, etc.

This is true of all the nav data repackagers.

The notion that a company like Jepps hires their own survey ships and collects brand specific hydrographic data -especially in foreign state sovereign waters- is pure male bovine excrement...

Anyway, from that fine print that nobody reads:

WARNING:
All charts are digitized directly from existing government and other official charts and should not be used solely for navigation. Digital charts are intended to be used as an aid to traditional navigational charts, not as a replacement. Only official government charts and notices to mariners contain all information needed for the safety of navigation, and as always, the captain is responsible for their prudent use. A prudent navigator never relies on any single source of navigational information.

Oh...and speaking of Jepps...There is yet another Aero/Nautical connection.
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Old 01-02-2012, 11:30   #67
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pirate Re: navigation trouble

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Originally Posted by lolarose View Post
hey, someone is out there with the boat not even knowing what is bloody CHART DATUM.
I know that... I know that...
Thats when the skipper says " Phil... Chart dat ummm.... lets see... course is 277T..."
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Old 02-02-2012, 02:37   #68
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Re: Navigation Trouble

Here is an interesting twist to this thread. I have just discovered that WA transport department are now providing us with GPS validation markers.

See Navigational safety

For American cousins, WA in this instance refers to Western Australian

Does anyone know if such a service is provided elsewhere?
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