Question 15 Deck Safety

The correct answer is D) VHF DSC. The VHF DSC (Digital Selective Calling) system has the least effective radius of operation compared to the other options. VHF radio signals have a limited range, typically around 20-30 miles from the shore, whereas the other systems (NAVTEX, HF SITOR, and MF NBDP) have a significantly larger operational range, allowing for more effective communication over greater distances at sea. NAVTEX, HF SITOR, and MF NBDP are all long-range maritime communication systems that can effectively transmit and receive information over hundreds of miles, making them more suitable for vessels operating in offshore or ocean environments. In contrast, the VHF DSC system is primarily designed for short-range communication and is less effective for vessels navigating in open ocean or distant from the coastline.