When you have recovered a fuel rod for the saucer, the instrument will let you use the X and Y dials to set the coordinates. But the planet coordinates the Queen gave you are too far away. You will need to use the coordinates from Mordred's missing journal page, which are X-56 Y-52.
(see related question)
The coordinates are locations (destinations) that are entered on the dials in the saucer Excalibur. When you have a new spaceship, the coordinates are displayed in the screen to tell you where you are. (see related question)
On the saucer Excalibur, you must enter coordinates before the ship will launch. (see related question)
You have to get a new fuel rod for the saucer and some coordinates to fly to. (see the related questions)
The saucer Excalibur is crashed in the mud swamp to the right of the Mill.
You have to fix the saucer by obtaining a new fuel rod. There is one in the robot invader held in the dungeon. Once it is replaced, you can dial in the coordinates to launch the saucer. (see related questions)
There is nowhere to enter a password. Fix the saucer and get the coordinates you need to fly it. (see related questions)
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You have to fix the saucer by obtaining a new fuel rod. There is one in the robot invader held in the dungeon. Once it is replaced, you can dial in the coordinates to launch the saucer. (see related questions)
You need a new green fuel rod and space coordinates to use the saucer Excalibur. (see the two related questions)
The Queen gives you the coordinates for the planets where the three space knights have gone, but for the saucer Excalibur they are too far away. The nearby moon at X-56 Y-52 is noted on the page from Mordred's journal (under his bed).
Use the hovercraft in the mill's attic to reach the crashed saucer Excalibur in the mud swamp. Fix the saucer and use Mordred's coordinates to fly to the Pewter Moon. (see related questions)
Once you have a new fuel rod, dial in the coordinates X-56 Y-52 to launch the saucer. (see related questions)