London: R. and W. Blachford, 116, Minories, 1828 (1830 & 1833). Pamphlet. An unusual compilation, the 1st 10pp being "Supplement-1833", which is not recorded on OCLC and the following 94pp "The New North Sea Pilot--- Note: The Depths of water mentioned... are by Compass"., which is possibly OCLC 316674420 issued in 1830. The pamphlet is issued with a title label on the front wrapper that does not conform with either title.
The Newberry Library owns a similar but different item; "The new North-Sea pilot, containing sailing directions from London to the Shetland Islands, and from Calais to the Scaw; also for the coast of Norway to Christiana...", OCLC 56207827. The National Library of Scotland holds Title: The new North Sea pilot Author: North Sea Accession Number: 316674420 , 94pp, which is likely the 2nd part of this pamphlet.
There is nothing on OCLC which matches the title page "Sailing Directions for the North Sea..." 1828, nor the 1833 Supplement are recorded on OCLC.
Sml. 8vo, (1) half title, 10pp; 94pp, orig. paper wrapper with title label on the front wrap, back wrapper missing. front wrapper marked with some loss, corners turned, some creases to the pages at the end. Good + overall. Item #24260