(AC 2249, 2250) The Islands are mostly indented and rocky, but with sandy beaches especially on NE sides. Pilotage is easy in good vis, but in other conditions great care is needed since tides run strongly. For details refer to Clyde Cruising Club’s Orkney Sailing Directions and the Admiralty Tidal Atlas NP 209. When cruising in Orkney it is essential to understand and use the tidal streams to the best advantage, avoiding the various tide races and overfalls, particularly near sp.
A good engine is needed since, for example, there are many places where it is dangerous to get becalmed. Swell from the Atlantic or North Sea can contribute to dangerous sea conditions, or penetrate to some of the anchorages. During summer months winds are not normally unduly strong, and can be expected to be Force 7 or more on about two days a month. But in winter the wind reaches this strength for 10-15 days per month, and gales can be very severe in late winter and early spring. Cruising conditions are best near midsummer, when of course the hours of daylight are much extended.
Stronsay Firth and Westray Firth run SE/NW through the group. The many good anchs include: Deer Sound (W of Deer Ness); B of Firth, B of Isbister, and off Balfour in Elwick B (all leading from Wide Firth); Rysa Sound, B of Houton, Hunda Sound (in Scapa Flow); Rousay Sound; and Pierowall Road (Westray). Plans for some of these are on AC 2622. There is a major oil terminal and prohibited area at Flotta, on the S side of Scapa Flow.
Tide races or dangerous seas occur at the entrances to most of the firths or sounds when the stream is against strong winds. This applies particularly to Hoy Sound, Eynhallow Sound, Papa Sound (Westray), Lashy Sound, and North Ronaldsay Firth. Also off Mull Head, over Dowie Sand, between Muckle Green Holm and War Ness (where violent turbulence may extend right across the firth), between Faraclett Head and Wart Holm, and off Sacquoy Hd. Off War Ness the SE-going stream begins at HW Aberdeen + 0435, and the NW-going at HW Aberdeen – 0200, sp rates 7kn.