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Scuba Forum / UK Scuba / February 2007HELP- Royal Charter Position
Hi, I am not a diver but have read much about the Royal Charter. I often walk along the headland at Moelfre and wonder where the Royal Charter remains lay. I looked it up on the www and it says N53 29" 17s & W04 15" 20s, looking on the map this seems much further away from the rocks than I thought, more towards Lligwy is this position correct ? Many Thanks Rick. Thinks its a protected Wreck ie Diving banned Another shipwreck book covering wales has it N53 21 46.8 W4 15 12.4 > Hi, > [quoted text clipped - 9 lines] > > Rick. Remember there can be discrepancies in lat/long depending on the geoid/ ellipsoid and datum they are specified relative to. http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/ guidecontents/ GPS uses WGS84, and produces lat/long values that differ significantly (e.g. 100m+ at Greenwich in the UK) from the OSGB36 datum used on Ordnance Survey maps and UK Admiralty charts (although newer charts use ETRS89 which is broadly equivalent to WGS84) See: http://www.mcga.gov.uk/c4mca/mcga-mld-page.htm?textobjid=40FEF5EBE6E31BAE In other words, for a lat/long to be useful in identifying a precise location you also need to know the datum! This has been a problem for many dive clubs who try to use a lat/long derived from markings/transits on a OSGB36 chart with a GPS unit that is set to its default of WGS84. Tends to result in long (often fruitless) echosounder searches or boring dives! Ian > Thinks its a protected Wreck ie Diving banned > Another shipwreck book covering wales has it [quoted text clipped - 15 lines] > > - Show quoted text - > Remember there can be discrepancies in lat/long depending on the geoid/ > ellipsoid and datum they are specified relative to. [quoted text clipped - 43 lines] > > - Show quoted text - Hi, Sorry for not getting back sooner. Many Thanks for your help. Regards. Rick. |
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