methods, quadmesh, raster, utils, geosphere, stats
raster, utils, geosphere, stats, reproj (>= 0.4.3)
devtools, knitr, maptools, oce, rgdal, rworldmap, testthat
devtools, knitr, maptools, oce, rgdal, rworldmap, sf, spex,
testthat (>= 2.1.0), rmarkdown, covr
devtools, knitr, spex, testthat (>= 2.1.0), rmarkdown, covr