Loran Drift control
Drift control (in Loran)
The equipment control by means of which the local time base oscillator is brought into synchronisation with the transmitted time base.
In Loran C and in most Loran A receivers the final "lock-in" is accomplished automatically.
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