Explanation: Survival craft portable VHF radiotelephones are designed for emergency voice communication. While they must operate simplex, the statement that they operate on Channel 70 is incorrect. Channel 70 (156.525 MHz) is exclusively reserved for Digital Selective Calling (DSC) distress alerts and routine calls. Survival craft radios transmit voice on distress and safety channels like Channel 16 (156.8 MHz) and other working channels (e.g., Ch-06 for intership). The other statements are true requirements: A) Watertightness (1 meter for 5 minutes) is a crucial safety standard for marine equipment. C) A minimum effective radiated power of 0.25 Watts ensures sufficient range for short-distance communications. D) A fixed, non-removable antenna prevents loss and ensures immediate operational readiness in an emergency.