Which key is used to indicate the end of a selection in a TELEX call via an Inmarsat-B SES?

In a TELEX call via an Inmarsat-B Ship Earth Station (SES), the key used to indicate the end of a selection is the plus sign. This is a standard feature in many data transmission protocols, where the plus sign serves as a clear delimiter that signals the conclusion of a particular user input. It helps the system understand that the subsequent data should be processed or that the command is being finalized.

Using this key correctly is essential for ensuring that messages are transmitted as intended without any ambiguity. In contrast, other keys like the asterisk, ENTER, or the hashtag do not serve the purpose of terminating selections in this context, as they may be designated for different functions, such as correcting inputs or initiating commands. Understanding this functionality is crucial for effectively utilizing the Inmarsat-B SES system and maintaining clear communication in maritime operations.