What is the sound signal for a vessel not making way?

The sound signal for a vessel not making way is indeed two long blasts. Under the International Regulations for Preventing Collisions at Sea (COLREGs), this specific signal indicates that the vessel is at anchor or otherwise not under way, and it communicates to nearby vessels that the vessel is not moving through the water.

This sound signal is essential for maritime safety, as it helps other vessels understand the status of the vessel making the signal and allows them to take appropriate action to avoid potential collisions. Knowing and using the correct sound signals is a fundamental aspect of navigational practices, which ensures that all vessels can operate safely within shared waters.