## BNWAS Operational Features

BNWAS generates warnings (audible or visual) according to its own algorithm. The officer of the watch must respond to the warning within the time limit established by internal procedures.

The response consists of operator actions on ECDIS (mouse movement or other action), or pressing the hardware button (dry contact).

ECDIS sends the `$--EVE` sentence over the 61162-450 network — the operator has performed an action. During active use of ECDIS, the `$--EVE` sentence is sent continuously.

If the operator ignores the BNWAS warning for any reason, the warning will be escalated to an alarm.

```{note}
Procedures, time delays, and BNWAS warning escalation periods are configured in BNWAS. ECDIS is a terminal device confirming the navigator's alertness.
```
