## Using gsw alone.

Suppose a CTD instrument lowered in the sea at 188E and 4N measures Practical Salinity to be 35 and in-situ temperature 10C (ITS-90) at pressure 100dbar. Then the following calculates the Absolute Salinity:

which sets`SA`

to 35.16555 g/kg. This value may be used along with
in-situ temperature and pressure, to calculate the Conservative
Temperature:
which sets `CT`

to 9.978249 ℃. Now, density and
surface-referenced potential density can be calculated with
yielding 1027.407 kg/m^{3}and 1026.956 kg/m

^{3}, respectively.

This is just a small sampling of what gsw can do; see the Documentation tab for a list of functions provided in this package, and the package documentation and vignette for more information.

## Using gsw within oce.

Gsw is integrated deeply into the oce package. It can be selected as an option to most functions. For example, a TS diagram in gsw convention can be created as follows.