What type of distress signal can be sent via DSC?

The correct answer is a maritime distress alert. This type of signal is specifically designed to indicate that a vessel is in distress and requires immediate assistance. Digital Selective Calling (DSC) is an advanced communication method used in maritime radio systems that allows operators to send distress alerts with greater efficiency and reliability compared to traditional methods.

When a vessel sends a DSC distress alert, it is transmitted directly to all nearby vessels and relevant coast stations, ensuring that the alert is received quickly by those who can respond. This capability enhances the chances of prompt action being taken in emergencies, as the signal includes essential information such as the vessel's position and the nature of the distress.

Other options do not fit the definition or purpose of DSC distress signals. Weather warnings and navigational alerts serve different functions and are not classified as distress signals, while safety messages are important communications but do not indicate an immediacy of distress like the maritime distress alert does.