Other things related to cm data:
[[,cm-method,
[[<-,cm-method,
applyMagneticDeclination,cm-method,
as.cm(),
cm,
cm-class,
plot,cm-method,
read.cm(),
rotateAboutZ(),
summary,cm-method
Other functions that subset oce objects:
subset,adp-method,
subset,adv-method,
subset,amsr-method,
subset,argo-method,
subset,coastline-method,
subset,ctd-method,
subset,echosounder-method,
subset,lobo-method,
subset,met-method,
subset,oce-method,
subset,odf-method,
subset,rsk-method,
subset,sealevel-method,
subset,section-method,
subset,topo-method,
subset,xbt-method