How should you make a routine call if your vessel call sign is ABC 263 and you wish to call DFB870?

To make a routine call to another vessel, you typically initiate the communication on channel 16, which is the internationally recognized distress and calling frequency. Once the call is established, you would then switch to a working frequency for further communication.

In this scenario, making a call to DFB870 using your vessel call sign ABC 263 means you would first transmit on channel 16. This channel is designed for safety and communication purposes, making it a suitable choice for initiating contact with another vessel.

While other channels may be used for specific services or operations, channel 16 is the standard for routine and emergency communications, ensuring that your call is heard and can be acknowledged correctly. Other options may not be suitable for the initial call or could imply a more specific operational context not appropriate for a routine communication. Thus, choosing channel 16 aligns with the standard procedures for maritime communications.