Yup, bar the spelling. To quote the North West Venturers' pilot, Maen Piscar lies on the direct track from Penrhos Bay to Rhoscolyn Beacons and dries 1.5 m. It has been used on more than one occasion by skippers desperate to collect the Club's "Rock Trophy". No good using the depth alarm, since it is surrounded by water 9-16 m deep.
Regarding the spelling, the use of "sic" suggests that a misspelt version is being quoted. Maen means stone. I had imagined that piscar was something to do with fish, but the Welsh for fish is pysgod. Piscaer seems an unlikely spelling, given that caer is common in welsh place names in the context of camp or fort - as in Caer (Chester); Caergybi = Cock's Fort (Holyhead); Caernarfon (castle at the mouth of the river Arfon).
Yup, South Stack. For those who don't like fighting the tide, you can find a South-going eddy during the (North-going) flood, but it's very close to the rock.
You can also get inside the overfalls at North Stack, but it is difficult to determine how close to go - the rocks stick out further:
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I had imagined that piscar was something to do with fish, but the Welsh for fish is pysgod.
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Viking familiarity with Anglesey is demonstrated by the place-names of Scandinavian origin which have been given to prominent coastal features as navigational aids: Anglesey itself (Önguls-ey, 'Önguls-island'), traditionally thought to incorporate a personal name - presumably a Viking leader, The Skerries (sker, 'isolated rock'), Piscar, Priestholm (presta, 'priest'-holmr, 'island') and Osmond's Air near Beaumaris (Asmundr- eyrr, a gravel bank near the sea
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I found it on the internet, so it must be true. (here)
Glazebrook says ' Maen Piscar, a dangerous rock drying about 1.5 m. at MLWS, with depths of from 16 to 29 m. round it, is situated about 7.5 cables west-north-westward from Rhoscolyn Head and 1 mile south-south-westward from Ravenspoint (Trearddur Bay). When covered the rock is sometimes marked by overfalls. '
In case you don't know it, the Glazebrook pilot is the definitive one upon which the NWVYC pilot is based. Glazebrook surveyed the whole of the North Wales coast from a 14 ft sailing dinghy during the 1950s. Beautifully written, it is also remarkably accurate. (The metric conversions are my own)