Notices to Mariners Week 6 (late)

[tillergirl]

With apologies for the lateness (voucher earning abroad).

Permanent

1. UKHO repeating Harwich Haven Notice No 2 of this year about the deletion of the shore light on the Landguard Freight Terminal
2. Change of light characteristics on the Southwold Lighthouse
3. Fun and games at the Sunk - the Sunk E1 SWB which was moved eastward at the end of last year is now moved back and its former eastward position now taken up with another SWB called Sunk E with ISO 2.5s + Racon(T). So there is now a string of three SWB coming in that way. But that's for big stuff not us.
4. An obstruction notified in the Maas Centre off the Hook of Holland but that is at 20+ metres and so should not affect us.

Temporary

1. Great fun this one - Beware Drones. Cefas notifying of a wave and tide powered (!) drone trundling between the Dowsing and Gabbard areas. we are to leave it alone boys and not pick it up and return it (or keep it!)
2. Maintenance dredging on the Felixstowe berths and approaches with dumping at the Gabbard site.
3. Usual London Array update - in-field cable work PLUS, surveying of the main power cable in the vicinity of the Princes Channel.

That's it. Should be on time next week. Potential delays to the service in March as I may be going somewhere where t'internet is remote (as opposed to this week just not being able to get into this site from France.

 

[Athene V30]

1. Great fun this one - Beware Drones. Cefas notifying of a wave and tide powered (!) drone trundling between the Dowsing and Gabbard areas. we are to leave it alone boys and not pick it up and return it (or keep it!)

Are these 'drones' free floating, towed or anchored in some way? Are they lit - not that I am planning any night sailing anytime soon!! Just interested.

Thanks for the info as always.

 

[tillergirl]

Peter

I actually know no more than is shown in the notice from which I assume that they float free. There isn't much windage so I suppose that stops them getting blown ashore but why wouldn't wave direction send it out of the area? It appears to have a light but whilst there is nothing in the photo to scale the drone it seems quite small.

I will ask a question of CEFAS and post their response.

 

[Bru]

Peter

I actually know no more than is shown in the notice from which I assume that they float free. There isn't much windage so I suppose that stops them getting blown ashore but why wouldn't wave direction send it out of the area? It appears to have a light but whilst there is nothing in the photo to scale the drone it seems quite small.

I will ask a question of CEFAS and post their response.

Getting more and more curious about this!

I can't find ANY information on t'web, not even the Notice to Mariners????

 

[tillergirl]

Nothing back from CEFAS yet. Notice is here: http://www.crossingthethamesestuary.com/page9.html Click on the Temporary list.

 

[Bru]

Nothing back from CEFAS yet. Notice is here: http://www.crossingthethamesestuary.com/page9.html Click on the Temporary list.

Doh! Why didn't i think to look in the obvious place!

Still surprised i couldn't find anything on a Web search

 

[tillergirl]

Harwich have embedded a scan of the Cefas notice in their notice so I don't think Google can index the content of the Cefas notice. I can't find where Cefas actually publish their notices - doesn't appear to be on the web. There is a potential issue arising that more and more companies/organisations are 'doing things' out there that affect navigation and yet there is no collated central place for this temporary stuff - apart from CTTE and ECS of course - which is why we try to bring it all together in one place - and try to make sense of what the notices are saying.

 

[nortonmotors]

Have a search on Google for 'marine glider' or 'wave glider' and you'll see what I think they mean by drone. Varying sizes, surface or submarine autonomous devices.
I found it by spotting 'glider' on a marine site and thought "What's that".

 

[Habebty]

Have a look at this pdf doc

http://www.cefas.defra.gov.uk/media/462360/mepf 08 p33 final report low res.pdf

actually don't if you're not interested in dredgers, (wrong link!!)


try this one instead

http://westernshelfobservatory.org/sea-glider-deployment-north-sea

 

[tillergirl]

I think that is a slightly different type - the one in the notice appears to be a surface drone and doing a google on wave glider, it seems some have a pod under the surface which can propel it. Hope I get an answer from Cefas early next week.

 

[nortonmotors]

The one I was looking at has two components, the surface one looking a bit like a surf board with a solar panel. This part is tethered to the submarine and wave action lifts the sub up and down in the water and angled vanes propel it along.
The original site I was looking at included a location trace for a glider, showing it moved several miles in a day.

 

[dennyjc]

From the NTM - it looks like one of these http://www.cbc.ca/news/canada/newfoundland-labrador/story/2012/08/22/ns-wave-glider-fish-robot.html
It also gives us a sense of its size

 

[tillergirl]

Clever thing 'init'. Wonder what they are looking for in the way of data.