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Detailed below are the sites located on the open-shore coast of Anglesey, North Wales.
| Site (code) | National Grid Reference | Aspect in ° from true North | Open shore arc in ° from true North | Biological exposure
scale unit |
| Porth Cwyfan a (PCa) | SH 337682 | 140 | 185 - 225 | exposed |
| Porth Cwyfan b (PCb) | SH 338681 | 165 | 210 - 255 | semi-exposed |
| Porth Trecastell (PT) | SH 332706 | 345 | 210 - 270 | exposed |
| Rhoscolyn (R) | SH 273749 | 165 | 140 - 175 | sheltered |
| Trearddur Bay s (TBs) | SH 253783 | 15 | n/a - n/a | very sheltered |
| Trearddur Bay e (TBe) | SH 251782 | 5 | 210 - 285 | exposed |
| Holyhead Harbour (HH) | SH 246833 | 10 | 295 - 0 | very sheltered |
| Porth Swtan (PS) | SH 299892 | 305 | 225 - 330 | exposed |
| Hen Borth (HB) | SH 319930 | 40 | 325 - 20 | sheltered |
| Porth Llanlleiana (PL) | SH 388951 | 285 | 275 - 325 | semi-exposed |
| Porth Eilian (PE) | SH 477930 | 315 | 0 - 5 | sheltered |
| Moelfre (M) | SH 513862 | 85 | 40 - 85 | fairly sheltered |
| Llanddona (L) | SH 574814 | 330 | 285 - 55 | semi-exposed |
Each site is, to varying degrees, exposed to the open sea. The angle through which sites are exposed to the open sea, the open sea arc, was determined for all the sites except Trearddur Bay s. This site is virtually enclosed by low cliffs except for a narrow gap which faces toward the shore of the main bay. Rhoscolyn is similarly enclosed but the open sea arc data are given because the protection seawards is limited to below mid-tide level.
Each site is ascribed a biological exposure scale unit based on the
guidelines given by Ballantine (1961) but could equally have been given
an exposure rating based on shore morphology (e.g. Thomas, 1986).
Detailed below are the sites located at Robin Hood's Bay, Yorkshire and Dale, Pembrokeshire.
| Site (code) | National Grid Reference | Aspect in ° from true North | Open shore arc in ° from true North | Biological exposure
scale unit |
| RHB North Cheek (NC) | NZ 955053 | n/a | 35 - 135 | fairly sheltered |
| RHB Boggle Hole (BH) | NZ 958041 | n/a | 10 - 120 | semi-exposed |
| Dale Black Rock | SM 813060 | 95 | 90 - 125 | very sheltered |
| Ballantine, W.J. 1961: A biologically-defined exposure scale for the comparative description of rocky shores. Field Studies1 (3) pp1-19. |
| Thomas, M.L.H. 1986: A physically derived exposure index for marine shorelines. Ophelia 25 pp1-13. |