Page History
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To enable caching of the map image:
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Call the main menu by clicking the 
button in the top left corner.
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Select the Settings item.
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, turn on the Cache map image option.
Overview
Content Tools
...
To enable caching of the map image:
...
Call the main menu by clicking the button in the top left corner.
...
Select the Settings item.
...
, turn on the Cache map image option.