Explanation: To initiate a direct TELEX call to a specific shoreside subscriber, the ship station sends a command that specifies the intention for a direct TELEX connection and includes the subscriber's TELEX number. The "DIRTLX0xxyyyy+" command serves this purpose: * **DIRTLX** signifies a desire to make a *direct TELEX* call. * **0** is the international access code often used before a country code. * **xxyyyy** represents the specific TELEX country code and subscriber number of the shoreside station. * The **+** sign typically acts as a command terminator. This command explicitly instructs the shore station to establish a TELEX circuit directly to the specified subscriber. The other options are incorrect: * **MSG+** is a general indicator for a message but does not specify a direct TELEX call or include subscriber information. * **AMV+** is not a standard command for initiating TELEX calls. * **OPR+** would typically be used to call the shore station operator for assistance, not to establish a direct connection to a specific TELEX subscriber.