How to delete selective ONC maps tiles in GM

I am using Global Mapper 17.2 and have some ONC maps that I wish to edit . My issue is that I have the entire southern hemisphere and wish to reduce that down to the size of Australia. 

I can edit on TIFFs and Shapefiles fine , but i am unable to for CADRG maps.

Am I missing something or does it require a script 




  • linnylinny Posts: 3
    I figured it out ... I had to re export the map as a cadet rpf map and chose to export via a selected box . 
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