int closestRadarX() - Returns the closest ship's X radar coordinate. (0-256)  Returns -1 if there are no ships on the radar.

int closestRadarY() - Returns the closest ship's Y radar coordinate. (0-256)  Returns -1 if there are no ships on the radar.

int closestItemX() - Returns the closest item's X radar coordinate.  Returns -1 if there are no items on the screen.

int closestItemY() - Returns the closest item's Y radar coordinate.  Returns -1 if there are no items on the screen.

int closestShipId() - Returns the closest ship's ID.  Returns -1 if there are no ships on the screen.