Romer

A romer is a navigational tool used for accurately determining grid references on a map. It's a transparent plastic card with markings that align with map scales and grid lines, allowing you to pinpoint precise locations on a map.

This official Geoscience Australia romer has scales in 1:25,000, 1:50,000, 1:100,000 and 1:250,000.

It also includes a protractor for measuring angles which is handy when double checking your compass bearing.