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Orbital Rendezvous - Vectors

Vectors give you a graphical representation of how fast each body is moving in the game.

Center on Earth When you turn Vectors on, each body will have a line that indicates how fast and in what direction it's moving. These can help you to null your velocity to rendezvous with slow-moving destinations, or to match velocities with fast-moving destinations. Very slow-moving destinations like Earth or Luna may not have visible vectors.
Center on Orbiter When you turn Vectors off, you won't see any vector lines. This gives you less screen clutter, but it makes the game more challenging.

Auto Zoom is on by default.