Materials Required---
A small magnet
A large nail or an iron rod
A small board of plastic or any other thing which floats.

Step 1:

Paste the magnet on the iron rod.

Step 2:

Paste the iron rod in the middle of the plastic board.

Step 3:

Put it in a bucket full of water and watch how the rod will point exactly towards north..
<strong>&nbsp;</strong><br> AHA! - But it's also pointing south.<br> How do you know which is which?
you can use a normal compass to locate the north..... and mark the north on the rod
<strong>&nbsp;</strong><br> Correct. So you need to add another step to the Instructable, otherwise it's just a floating magnetised rod.
The expanded metal isn't mentioned, but is it just to keep the rod in place?
yes...... you can tape the rod in place

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