The 30-page booklet describes topographic maps, using a GPS, how a compass works and how to navigate with compass and map.A plastic see-through 'Map Roamer' is included in a pocket at the rear of the book. This device allows the measurement of maps at four different scales (25k, 50k, 100k, 250k) with a compass dial which can be laid over the map for accurate bearings.Additional product informationISBN: 9314231221297 Size: 240mm X 100mm. Pages: 30 pages. Binding: Centre staple-bound. Publication Date: 2014. Images (Colour or Mono) Full colour. Author and/or publisher Australian Government. (Geoscience Australia)