Plans included: Pierowall Harbour (1:40 000) Whitehall Harbour (1:25 000) Bay of Kirkwall (1:12 500) Stromness Harbour (1:12 500) Scrabster Harbour (1:7500) Wick Bay (1:10 000) On this 2017 edition the latest depths have been applied where available. The chart specification has been improved to show coloured light flashes. There has been general updating throughout.