Explanation: Shipboard transmitters using F3E (FM voice) emission, particularly those operating in the VHF Marine Radiotelephone Service (governed by FCC Part 80), are subject to specific power limitations. For operations in the 156-162 MHz band (the standard marine VHF channels), the maximum authorized carrier power is **25 watts**. This regulatory limit is established to minimize interference between vessels and shore stations, efficiently manage the shared spectrum in a congested environment, and ensure reliable short-range communications. While higher power limits exist for other types of emissions or marine services (like HF SSB for longer distances), 25 watts is the standard maximum for VHF FM voice on ships. Therefore, 500, 250, and 100 watts all exceed this specific regulatory limit for F3E emission in the marine VHF band.