"subset"(x, subset, ...)coastline object, i.e. one inheriting from coastline-class.x.coastline object.
coastline data: [[,coastline-method,
[[<-,coastline-method,
as.coastline,
coastline-class,
coastlineBest, coastlineCut,
coastlineWorld,
download.coastline,
plot,coastline-method,
read.coastline.openstreetmap,
read.coastline.shapefile,
summary,coastline-method