The dashed lines represent rays of infra-red light, which are broken every time someone walks through them.

The letters in the squares are directions. e.g. 2S means you must go two squares south from here.

A compass is included.
A maze. The top row contains 1E, 2S, 1S, 2W, 4W. The second row contains 2S, 1E, 2S, the plaque, 1N. The third row contains 1E, 1E, 1S, 2N, 1W. The fourth row contains 1S, 1S, 1W, 2N, 1W. The last row contains 4W, 3E, 1E, 4N, 1N.
N
E
S
W
1E
2S
1S
2W
4W
2S
1E
2S
1N
1E
1E
1S
2N
1W
1S
1S
1W
2N
1W
4W
3E
1E
4N
1N