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This is the brief help for the map at http://maps.ozultimate.com
Layers: The map has two main layers: the NSW Imagery (Aerial Photos) layer and the NSW Topographic Map layer. The map only covers NSW. Use the slider in the top right to transition from one to the other.
Load Files: Drag and drop GPX, KML or GeoJSOn files on to the map and they will automatically appear, or you can use the File Open icon.
Draw: Click on the respective icons to draw Lines, Polygons or Markers. These can be edited or deleted using the icons below.
Area Calculation: When you have drawn a Polygon, the area will pop up. IF you subsequently edit the Polygon, the area will recalculate. Useful for things like measuring the size of canyon catchments.
Save to Computer: Use the Save icon to download what you have drawn to your computer.