Other things related to adv data: [[,adv-method,
[[<-,adv-method, adv-class,
adv, beamName,
beamToXyz, enuToOtherAdv,
enuToOther, plot,adv-method,
read.adv.nortek,
read.adv.sontek.adr,
read.adv.sontek.serial,
read.adv.sontek.text,
read.adv, rotateAboutZ,
summary,adv-method, toEnuAdv,
toEnu, velocityStatistics,
xyzToEnuAdv, xyzToEnu
Other functions that subset oce objects: subset,adp-method,
subset,amsr-method,
subset,argo-method,
subset,cm-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