The term 'Treasure Hunter's Aid' is composed of two words, SONAR and MAP. Sonar stands for Sound Navigation and Ranging and is a technique used to detect objects underwater by using sound waves. It is an important tool for treasure hunters as it helps them locate objects that may be hidden beneath the surface. MAP is a representation of an area, usually drawn to scale, showing features such as roads, boundaries, rivers, and buildings. Maps are also essential for treasure hunters as they help them navigate and find their way around unfamiliar areas.