found: Glossary of mapping, charting, and geodetic terms, 1973:(loran chart: plotting charts on which loran ground wave line of positions and sky-wave correction values have been printed, for use in loran navigation)
found: Glossary of the mapping sciences, 1994:Loran chart (a chart on which are shown the ground-wave lines of position and sky-wave corrections for Loran) chart, long-range navigation (a small scale (1:3,000,000 or less) aeronautical chart designed for navigation on long flights and relying principally on dead reckoning and celestial navigation)
found: Wikipedia, Dec. 1, 2009:(LORAN: abbrev. for long range navigation; section on Loran charts: common marine nautical charts include visible representations of TD lines at regular intervals over water areas. The TD lines representing a given master-slave pairing are printed with distinct colors, and note the specific time difference indicated by each line)
