Example sea ice concentration data from the Southern Ocean (2018-10-15). (See "data-raw/ice.R").
if (FALSE) { # \dontrun{
ll <- "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
xy <- coordinates(spTransform(as(SOmap_data$fronts_orsi, "SpatialPoints"), ll))
## just because you can doesn't mean you should ...
SOmap_auto(xy[,1], xy[,2], bathy = ice, input_points = FALSE, levels = c(15, 30, 60, 90))
} # }