Which statement concerning frequency band selection and propagation most corresponds with standard practice.

Correct Answer: Option C — Propagation "rules of thumb" are usually sufficient for routine operations.

While complex propagation modeling exists, practical GMDSS operations rely on established 'rules of thumb' for frequency selection. These heuristics provide sufficient guidance for routine ship-to-shore traffic, allowing operators to select appropriate bands without needing to perform real-time, complex mathematical calculations of Maximum Usable Frequency (MUF) for every transmission.