Agency boats carry an ______ radio as a backup communications system. What type is it?

• A. AM
• B. FM
• C. SSB
• D. VHF

Answer: (A)

Backup communications should be a simple, robust option that still works even if more modern gear is down. An AM radio fits that role well because AM systems have historically been used for maritime safety and distress channels on the MF/HF bands, and they can be built and operated with straightforward, low-power equipment. This makes AM a reliable, widely accessible fallback that crew can use without relying on advanced or highly specialized gear.

In contrast, the other types require more specialized equipment or conditions: VHF is the main near‑shore, line-of-sight system; SSB is great for long-range but needs more capable gear and trained operators; FM provides clearer sound but can be limited in range and reliability in some conditions. That's why AM is chosen as the best backup option.