Admiralty Chart No 2420 Achill Head to Slyne Head, Published 1855, Richard Brydges Beechey, 19 December 1855

Nautical chart of achill head to slyne head, at a scale of 1:145,000. From roonagh head north surveyed by commander r. B. Beechey, lieut a. G. Edye and mr a. B. Usborne; from roonagh head north surveyed by captain g. A. Bedford, lieutenant f. W. Sydney, messrs. J. E. Davis & j. B. Horner; 1854. Not current - not to be used for navigation! Date: 19 December 1855.