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Old 26-07-2015, 01:59   #1
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Hey! A new uncharted shoal in the Broadwater

Using very low tech but timeless techniques, we discovered a shoal right in an alleged navigable area yesterday! (Ran into it at over 6 knots).

The area is the Broadwater, between Moreton Bay and Southport in Queensland. The exact location is 27d 42.20m S, 153d 21.64m E. This puts it just south of the high tension wire crossing, and about 50 metres W of a green channel marker. The best chart in my possesion (2011 date) shows (interpolating between nearby soundings) that the depth should be around 3 metres at datum. In fact it is <2 metres near high water, with the Brisbane bar at 1.7 m. The shoal appears to be around 30 m in diameter, but I didn't do a good job of surveying in all directions. It consists of soft mud, and is near the junction with another channel, so it is an area subject to change. There appears to be navigable water on both sides, but it is definitely deeper to the W of the shoal... that's how we eventually escaped.

At any rate, I thought other cruisers who transit this channel might be interested.

Jim
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Old 26-07-2015, 02:08   #2
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Re: Hey! A new uncharted shoal in the Broadwater

Quote:
Originally Posted by Jim Cate View Post
Using very low tech but timeless techniques, we discovered a shoal right in an alleged navigable area yesterday! (Ran into it at over 6 knots).............
At any rate, I thought other cruisers who transit this channel might be interested.

Jim
A technique that worked for Jim Cook and many others

Make sure you send a report to the Hydrographer.

Ping
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Old 26-07-2015, 03:35   #3
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Re: Hey! A new uncharted shoal in the Broadwater

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Originally Posted by El Pinguino View Post
A technique that worked for Jim Cook and many others

Make sure you send a report to the Hydrographer.

Ping
I'd like to do that. Do you have an address or such so that I can do so?

A simple minded Google search didn't come up with anything specific.

Jim
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Old 26-07-2015, 03:51   #4
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Re: Hey! A new uncharted shoal in the Broadwater

Lookee here Australian Hydrographic Service - Contact Information

and try this addy hydro.ntm@defence.gov.au

Back in the dreamtime there used to be a page on the back of the hard copy NtM's that you filled in and posted... maybe there still is....

I did a bit.. disproved the existence of 'Joes Island' up the top end of Western Port and a bit of other stuff.
Sent in a big one on Macquarie Harbour in 2001... the old 'imperial ' chart was a disaster with a serious error in longitude plus other stuff... I was there for a few months .... Received a nice letter from the British Hydrographer and a free copy of the new metric chart when it came out for that one. I think a chap named Bolger was the hydrographer at the time.

Pity they don't have an easily accessed form for download... maybe they do
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Old 26-07-2015, 03:53   #5
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Re: Hey! A new uncharted shoal in the Broadwater

Hey, WT… it's the broadwater Jim. It was never meant to match the charts. It's just like Moreton Bay, the deep and shallow spots move around all the time or at least they did back in the day when I knew what sun was.

Hope you didn't do any damage apart from outrage to Hydrographer.

Get back offshore
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Old 26-07-2015, 03:56   #6
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Re: Hey! A new uncharted shoal in the Broadwater

Was a time when they named stuff after the ship or the bloke that hit them....

I don't know if its a good or bad thing... a bit of a fame or infamy thing.

If they still did it there would be a Ping Patch, Bajo del Pingo, Rocas del Pingo, Isla del Pingo, Tierra del Pingo and a rather long list of other stuff I have smacked.......
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Old 26-07-2015, 03:59   #7
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Re: Hey! A new uncharted shoal in the Broadwater

Hi Jim,
Try this Australian Hydrographic Service
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Old 26-07-2015, 04:07   #8
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Re: Hey! A new uncharted shoal in the Broadwater

This shows how long I have been 'out bush'....
Just found it...
Australian Hydrographic Service - eNotices
Bonzer stuff!
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Old 26-07-2015, 04:39   #9
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Re: Hey! A new uncharted shoal in the Broadwater

Quote:
Originally Posted by Jim Cate View Post
Using very low tech but timeless techniques, we discovered a shoal right in an alleged navigable area yesterday! (Ran into it at over 6 knots).
There are two sorts of sailors in Moreton Bay Jim, those that have run aground and those that tell lies.
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Old 26-07-2015, 05:37   #10
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Re: Hey! A new uncharted shoal in the Broadwater

Quote:
Originally Posted by El Pinguino View Post
Was a time when they named stuff after the ship or the bloke that hit them....

I don't know if its a good or bad thing... a bit of a fame or infamy thing.

If they still did it there would be a Ping Patch, Bajo del Pingo, Rocas del Pingo, Isla del Pingo, Tierra del Pingo and a rather long list of other stuff I have smacked.......
Bet my Capri list would be longer than your Pingo list
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Old 26-07-2015, 06:10   #11
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Re: Hey! A new uncharted shoal in the Broadwater

I've checked all my charts and the latest Queensland Transport "Beacon to Beacon" and it looks like you were right where you should have been! Perhaps the shallows now extend north west from the nearbye bank marked by the green navigation light you mentioned.

How did you find getting under the overhead high voltage wires, 20.3m clearance at mid span and its sounds like you were there at high water!

My mast is 21.6m so I have to go at low water and pass near to the pilon. It freaks me out every time....
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Old 26-07-2015, 06:14   #12
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Re: Hey! A new uncharted shoal in the Broadwater

That's the way we found (and named) Neko Rock off Isla San Telmo in the Las Perlas islands of Panama.
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Old 26-07-2015, 06:21   #13
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Re: Hey! A new uncharted shoal in the Broadwater

Just a reminder that the latest Beacon to Beacon charts can be downloaded free from the MSQ website:

http://www.msq.qld.gov.au/~/media/ms...nbaybeacon.pdf


http://www.msq.qld.gov.au/~/media/ms...oastbeacon.pdf


You can find the other charts (they are *.pdf, not GNSS-referenced charts that you can simply import into OpenCPN or other electronic nav program) via: Boating maps (Maritime Safety Queensland)


I think the bottom line is that some years the sandbanks move faster than any survey work schedule. So Beacon to Beacon and the channel markers can get out of date fast.


Al
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Old 26-07-2015, 06:49   #14
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Re: Hey! A new uncharted shoal in the Broadwater

The Cate shoal?
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Old 26-07-2015, 10:29   #15
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Re: Hey! A new uncharted shoal in the Broadwater

Jim & Anne's stop.
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