Base line

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The line joining the two points between which electrical phase or time is compared in determining navigational co-ordinates. (For two ground stations this will be the line joining the two stations.)

Reference: Icharge currentIntensity.R.EIlluminanceEnergy. (modified)

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)