I see that Maretron’s DSM150, DSM200, and DSM250 displays have a WSO100 configuration setting called "Barometric Pressure:"; what is this?

Maretron’s DSM150, DSM200, and DSM250 displays have a WSO100 configuration setting called "Barometric Pressure:", which is used to adjust the WSO100 barometric pressure reading to account for local variation. For example, if you would like all the barometers on board to read the same, or you want to adjust per your local weather report, you can use this setting to adjust the WSO100.