Loran Base line extension monitor
Base line extension monitor (in Loran)
A Loran C monitor station installed on the base line extension usually on a temporary basis, to assist in the setting up of a Loran C system.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM