🔍 Key Concepts

• Difference between MF (Medium Frequency) and VHF (Very High Frequency) bands • Traditional radiotelephony distress and calling frequencies used in GMDSS-era equipment • Which frequencies are expressed in kHz versus which are designated as VHF channels (Ch-xx)

💭 Think About

• First, separate the answer choices into MF-band options and VHF-channel options. Which band does the question specifically ask for? • Think about classic distress frequencies historically memorized by mariners. Which one is tied to MF radiotelephony? • Ask yourself: which of these is a frequency in kHz and which are VHF channels that correspond to around 156 MHz?

✅ Before You Answer

• Confirm which options are expressed as kHz (kilohertz) – those are frequency numbers, not channel labels • Recall that MF is roughly 300–3000 kHz, while VHF marine is around 156 MHz and uses channel numbers (Ch-xx) • Verify which kHz value has been historically designated as the MF distress and calling frequency in radiotelephony regulations