An errata was published on (date tbc) as a result of a change on PDF pages 5 and 12 within the section titled “Options”. The changes were made to the hyperlinks on the footer of these pages as the previous websites have been archived. Reference 3 within the footer of page 5 was changed from http://www.gov.scot/Topics/marine/marine-environment/mpanetwork/marinespas/spaworkshop to https://www.webarchive.org.uk/wayback/archive/20160403003626/http://www.gov.scot/Topics/marine/marine-environment/mpanetwork/marinespas/spaworkshop. Reference 8 within the footer of page 15 was changed from http://www.gov.scot/Topics/marine/marine-environment/mpanetwork/Displacement to https://www.webarchive.org.uk/wayback/archive/3000/https://www.gov.scot/Topics/marine/marine-environment/mpanetwork/Displacement. The HTML and PDF have been updated to reflect these changes.