Talk:Dynamic positioning

Dynamic positioning was a good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.

Article milestones
Date	Process	Result
April 14, 2007	Good article nominee	Not listed

Transport: Maritime

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Engineering

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Ships C‑class

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Scuba diving Low‑importance

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achievable accuracy[edit]

I think the article could benefit from information regarding the achievable accuracy. E.g. in case of a drilling ship - within how many meters can the position be maintained? — Preceding unsigned comment added by 2A02:908:1342:94E0:B590:213B:58A3:8CDD (talk) 08:07, 12 March 2016 (UTC)[reply]

Untitled[edit]

I have added referenes to class requirements and I want to add a page about Class 2.5.

This is because this is an issue in which I am interested.

If any one else shares this interest then "say".

Class 2.5[edit]

It looks to me as if the author made up the term himself. If so this entry can be deleted. Otherwise please show where the term comes from. 194.151.10.81 23:12, 19 March 2006 (UTC)[reply]

Dynamic postioning[edit]

As Smit said (back in october :o), these should be merged as it is obviously a typo... I'll let someone who knows the subject though. --Dean Earley 19:16, 2 January 2006 (UTC)[reply]

GA[edit]

Sorry but i'm failing this article. It is currently too list and contains too many tables making it fail crieria 1a "well-written". Also with references they are missing details such as publisher, author and date (of there are) and last access date. An ample of this can be found at Reign in Blood go to the reference section. The {{cite web}} may help.

The following suggestions were generated by a semi-automatic javascript program, and might not be applicable for the article in question.

Consider adding more links to the article; per Wikipedia:Manual of Style (links) and Wikipedia:Build the web, create links to relevant articles.^[?]
There may be an applicable infobox for this article. For example, see Template:Infobox Biography, Template:Infobox School, or Template:Infobox City.^[?] (Note that there might not be an applicable infobox; remember that these suggestions are not generated manually)
Per Wikipedia:Manual of Style (numbers), there should be a non-breaking space -   between a number and the unit of measurement. For example, instead of 1000 meter, use 1000 meter, which when you are editing the page, should look like: 1000 meter.^[?]
Per Wikipedia:Manual of Style (headings), headings generally should not repeat the title of the article. For example, scope of Dynamic positioning could be renamed to Scope
Please make the spelling of English words consistent with either American or British spelling, depending upon the subject of the article. Examples include: meter (A) (British: metre), metre (B) (American: meter), ization (A) (British: isation), isation (B) (American: ization), any more (B) (American: anymore).
Nowadays there are more than 1000 DP ships. Please elaborate on this, As of (insert date) and is it with DP?
You should merge the History section into three paragraphs with some references.

Basically the tables and lists should be turned into prose and some more inline references would be nice. M3tal H3ad 08:19, 14 April 2007 (UTC)[reply]

Should Dynamic Positioning Systems be merged into this article?[edit]

I propose merging Dynamic Positioning Systems into this article. Cardamon 21:58, 2 December 2007 (UTC)[reply]

I have done this merger. It would be good if an expert were to check it. Cardamon (talk) 04:17, 3 January 2008 (UTC)[reply]

Cruise Vessels[edit]

Lately a lot of cruise vessels (older and newer) have been fitted with DP systems or equivalents due to the increasing number of tropical destinations that have put a ban on anchorage and lacks port facilities for large cruise vessels. So to put an end to the need of anchoring, many of these vessels use such positioning systems to maintain anchorage without the use of anchors. --Skippern (talk) 18:49, 31 March 2008 (UTC)[reply]

Latitude, not Altitude?[edit]

I'm not sure enough of my ground to fix this myself, but in the section Position Reference Systems > DGPS, there is a reference to signal degradation at "high altitudes". Surely this should be "high latitudes"? It is pretty hard to imagine any situation where a vessel using DP would be at "high altitudes" - unless planes use it?? Ian Page (talk) 00:07, 6 September 2009 (UTC)[reply]

Altitude, not latitude[edit]

GPS and DGPS operation is not dependent on latitude. It is supposed to give accurate position fix anywhere in the world. "High altitude" in the article refers to the satellite's altitude from the observer's horizon of the DP ship. GPS satellite fixes are much more accurate and precise when satellites are at lower altitude in the observer's horizon than satellites at hiher altitudes. —Preceding unsigned comment added by 122.55.96.154 (talk) 08:09, 8 July 2010 (UTC)[reply]

I wondered about this myself, so I went to the USCG page and found a map showing the GPS HDOP (horizontal dilution of precision) for 31 March 2010 - a notice for when it would be unusually high in a few places on the world. The locations were scattered around the world and high latitudes did not seem to get the short end of the stick.

That said, I would expect the vertical dilution of precision (i.e., altitude accuracy) to be poor at high latitudes because the GPS satellite inclination of 55 degrees means you can never see a satellite at high elevation over the poles, and that's what you need for best altitude accuracy.

But I'm still puzzled as to what the original author meant by "high altitude". Another possible reason for poorer accuracy at high latitudes is the greater uncertainty in ionospheric propagation delay due to auroral activity. Also, DGPS requires that the user be close to the reference station (so as to see correlated errors) and there might not be any (or very many) DGPS reference stations at high latitudes. Karn (talk) 03:07, 2 April 2012 (UTC)[reply]

High latitude (Polar Regions) gives problem in receiving correction signal required for DGPS (GPS alone is not suitable for Dynamic Positioning). These as in most cases geostationary satellite are transmitting these signals. The issue of local reference stations is on the way out as newer DGPS units are dual frequency to sort out any atmospheric disturbance. Left for the newer correction signal is to correct clock and satellite position. --Sverker1970 (talk) 11:49, 15 August 2012 (UTC)[reply]

Templates on the sea floor?[edit]

The last sentence of the 2nd paragraph reads:

"This allows operations at sea where mooring or anchoring is not feasible due to deep water, congestion on the sea bottom (pipelines, templates) or other problems."

What is a "template" in this context? If this information is accurate, then this should be wikilinked to something, because a lay reader won't know what it is. Kevyn (talk) 20:06, 15 August 2011 (UTC)[reply]

Better late than never, I guess. A template is a structure used for wellhead positioning on the seabed. Oil production terminology. • • • Peter (Southwood) ^(talk): 14:33, 13 June 2017 (UTC)[reply]

External links modified[edit]

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