A more thorough explanation:

Definition: NOS stands for National Ocean Service, which is a part of the National Oceanic and Atmospheric Administration (NOAA).

Example: The NOS is responsible for providing information and services related to the oceans and coasts of the United States, such as tide and current predictions, coastal mapping, and marine ecosystem monitoring.

Explanation: The example illustrates how the NOS is a government agency that focuses on the management and protection of the nation's oceans and coasts. The NOS provides important information and services that help ensure the safety and sustainability of these natural resources.