What would not be a negative outcome of an Urgency DSC call that causes the transceiver to switch?

In the context of urgency DSC (Digital Selective Calling) calls, it's critical to understand the implications of the transmission method and frequency used. The identification of negative outcomes relates to the efficiency and effectiveness of communication.

A situation where the requested frequency is on the DUS (Distress, Urgency, Safety) table in the J2B emission would not be considered a negative outcome because J2B is a valid mode of emission for the type of communication involving an urgency call. This means that using this frequency allows the call to be transmitted effectively without leading to confusion or interference. The availability of J2B on the DUS table suggests that the communication channel is specifically assigned for such use, allowing vessels to communicate important safety information without complications.

The other options present scenarios where either the frequency is not listed on the DUS table, which would lead to uncertainty and potential communication failures, or where emissions are mismatched or inappropriate for the situation at hand, thus complicating the urgency call and potentially leading to misunderstandings among vessels. Therefore, the presence of a frequency on the DUS table in the J2B emission assures that the communication can proceed as intended, reinforcing its categorization as a non-negative outcome.