When you first run the software the opening nag screen shows momentarily a button that says VPN mode. Click that. Another way is in the options menu (from memory) you can set it into VPN mode. Once you do that there are buttons on the main screen to toggle offline mode on and off. Again not a consistent naming convention for this function - but it works. Just get the map at the right zoom level as you cannot change it once you are in the field with no internet.
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Sent from Samsung S4 via Tapatalk