A statutory instrument dating to 12 January 1976 defines a large area of sea that is subject to the byelaws of the Aberporth Firing Range. When the range is in use for firing, a red flag and a yellow flag by day and a red light and yellow light by night were to be shown at two places near the Aberporth Rangehead. An historic chart notes that about 20 targets, moorings and buoys are positioned within 20 miles of Aberporth - some being marked with flashing lights. The locations are frequently changed but are shown to centre on positions (expressed as digitial degrees and seconds) 52.56918, -4.68671; 52.34345, -4.32961; 52.2034, -4.5441; 52.29371, -4.63524; and 52.38332, -4.64386. The range is associated with the sinkings of HMS WHIRLWIND (NPRN 507233) and HMS LEWISTON as targets in the

Sources include:
Admiralty Chart 1972, Cardigan Bay -Central Part, printed November 1994, RCAHMW Mapping Collections
Statutory Instruments, 1976, No 64. D/DS23/6/14. The Aberporth Range Byelaws 1976
(https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/39643/aberporth_range.pdf)

Maritime Officer, RCAHMW, October 2014.