Salinity read-out
The navigational information on the top bar may include a read-out of the current salinity.
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Prerequisites
To see this information on the top bar, you must enable it using the Top Bar functions in the Display Options dialog box. The Display Options dialog box is located on the Display menu.
Description
The top bar may show you the current water salinity.
To provide the current salinity, use the Environment dialog box. Input any salinity value between 0 to 40 PSU. The salinity value you provide is an important parameter used to calculate the sound speed and the absorption curve. The Environment dialog box is opened from the Setup menu.
Conceptually the salinity is the quantity of dissolved salt content of the water. [...] Seawater typically has a salinity of around 35 g/kg, although lower values are typical near coasts where rivers enter the ocean. Rivers and lakes can have a wide range of salinities, from less than 0.01 g/kg to a few g/kg, although there are many places where higher salinities are found.
https://en.wikipedia.org/wiki/Salinity, April 2016
Related topics
Navigational information
Defining settings related to user preferences and individual customizing