Which projection would you use to plan a voyage by the ship in a straight line across ocean?

For planning a voyage by ship in a straight line across the ocean, the Mercator projection is the most suitable. This cylindrical map projection preserves angles, making it useful for navigation as it allows sailors to plot a straight course with a constant compass bearing. However, it does distort the size of landmasses, especially near the poles, so it's primarily used for navigation rather than for representing areas accurately.