Scale: 1:1,700,000. chart of the North Sea. Lights coloured, soundings in fathoms. Mauscript tracks marked, Red 'Outward', Blue 'Homeward' and also navigational observations and dates. Caution note "Mined Area, for state of mined areas see Admiralty Notice to Mariners of latest date on this subject". Yacht 'Blue Bird of Thorne 1956' marked in manuscript. Manuscript chart corrections to 1947