Which statement is NOT true regarding the requirements of survival craft portable two-way VHF radiotelephone equipment?

The statement that is NOT true regarding the requirements of survival craft portable two-way VHF radiotelephone equipment is that it operates simplex on Ch-70 and at least one other channel.

In reality, the equipment must be capable of operating on a designated distress channel, which is Channel 70. However, it is not restricted to simplex operation on just one other channel; instead, it should be able to communicate on multiple channels to ensure effective distress communication. Therefore, while it certainly operates on Channel 70, the requirement to operate on at least one other channel can include various channels, often allowing for duplex operation as well, depending on the equipment's design and the regulatory standards.

Understanding this context emphasizes the flexibility and operational requirements of emergency communication systems and highlights the critical nature of being able to communicate on multiple channels to enhance survival chances in emergencies. The other statements accurately reflect the required features for the equipment; for example, being watertight supports functioning in adverse conditions, while a minimum effective radiated power ensures the signal can be transmitted over suitable distances.