This document provides guidance on radio communication procedures for vessels at sea. It discusses protocols for different situations like overtaking, head-on encounters, and crossing. It also outlines reporting procedures when communicating with vessel traffic services in Singapore, Thailand, and when arriving at ports in Bangkok. Key details covered include using designated radio channels, providing vessel details like ETA, draft and cargo, and coordinating pilot boarding. The overall purpose is to demonstrate proper radio communication techniques for safe vessel operations and regulatory compliance.