Land Marks define the areas in which the Quarry, Filler and Architect Table operate. Depending on the shape required, more than one may be necessary (such as a three-dimensional shape for the Builder). Land marks can be placed on all sides of a block, not just the top. They can also be placed on Glass.
UsagePowering a land mark with Redstone will cause it to project blue beams of light along each axis for 64 blocks. The beams are not stopped by terrain, and can be used as a guide to placing your next land mark.
When you have placed 2 or more land marks placed in a line, right-click on one. They will then be "connected" by red beams of light. The beams mark the lines that will be used by the machine that is attached. Terrain will not stop the red beams. Land marks can be a maximum of 63 blocks apart, spanning a line 64 blocks long.
Placing a machine next to an activated land mark will cause all connected land marks to pop off the ground.
Note that placing a Quarry inside the line of a beam will cause it to destroy itself while it is setting up.
Sometimes when you use Land marks to mark the mining area for a quarry the quarry will not recognize the area and default to 9x9. This is fixed by removing the Land marks, placing them again and activating the land marks by clicking the one that you place the quarry next to...in other words you have to:
place L1, L2, L3, L4, go back to L1, activate, place quarry
place L1, L2, L3, L4, activate, go back to L1, place quarry
for it not to bug.
When placing a compatible machine next to a completed Land mark shape, some marks do not pop off and stay in place. Check your area, so that you do not lose them.
Alternativelty you can pick up the quarry and place it directly behind (on the outside of the land mark area) one of the blue land mark torches.