After 2017-12-23     <<< data >>>

before 2018-01-30  DEM data: File pathnames were changed
                     with the script 'renewal_script'
                     (eg: "dem40/Z53/N33E135.alt" << "wm40/33135.alt")
                   shore data: File pathnames were changed
                     with the script 'renewal_script'
                     (eg: "Z53/N33E135.coast" << "SW33/cst135.jpn",
                          "t53/N33E135.river" << "SH33/riv135.jpn", etc.)
                   geoid and IGRFCOEF data: no update

2020-01-10         IGRFCOEF/igrf13.coef was added