Try these nautically themed links.
Chatham Historic Dockyard – Museum from home
https://thedockyard.co.uk/the-collections/museum-from-home/
Hull Maritime Museum – Learning resources for primary schools
https://maritimehull.co.uk/get-involved/learning/primary-schools
Kids in Museums – Round-up of museum activities to enjoy at home
https://kidsinmuseums.org.uk/news/
Mary Rose – Things to make & do
https://maryrose.org/things-to-make-and-do/
RNLI – Kids’ activity sheets
https://rnli.org/youth-education/education-resources/activity-sheets-and-posters
ss Great Britain – Design & Make
http://www.ssgreatbritain.org/brunel-institute/learning/stuff-do-home/design-make
Trinity House – Buoys, Beacons and Bananas Key stage 1-3 education resources
https://www.trinityhouse.co.uk/education