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**neilh** · April 28th, 2008, 01:33 PM

Quote: (Originally Posted by David Martin)

We brought a couple of boards along just in case last autumn. Funnily enough, even with the boltsnaps, they stayed on the boat (and not even the boat we dived off, but the boat left in the harbour).

Quote: (Originally Posted by David Martin)

We just couldn't cover the site with the NAS method in the available time, even it was possible to hammer permanent markers into the solid seabed for control points.

With the distance/bearing method, we'll should get reasonable data, which combined with video/stills is more useful than a very accurate survey of a small portion of the site.

Thanks David, interesting stuff - presumably this is a problem that NAS would also encounter, especially around the UK. Are they interested in your findings and techniques on this project or is it more the case that typical NAS projects have enough funding and time available for it not to matter?

April 28th, 2008, 01:33 PM	#6 (permalink)
neilh(Offline) Haemoglobin on the bus... Join Date: Nov 2005 Location: Barnsley, UK Posts: 1,914	Quote: (Originally Posted by David Martin) We brought a couple of boards along just in case last autumn. Funnily enough, even with the boltsnaps, they stayed on the boat (and not even the boat we dived off, but the boat left in the harbour). Quote: (Originally Posted by David Martin) We just couldn't cover the site with the NAS method in the available time, even it was possible to hammer permanent markers into the solid seabed for control points. With the distance/bearing method, we'll should get reasonable data, which combined with video/stills is more useful than a very accurate survey of a small portion of the site. Thanks David, interesting stuff - presumably this is a problem that NAS would also encounter, especially around the UK. Are they interested in your findings and techniques on this project or is it more the case that typical NAS projects have enough funding and time available for it not to matter?