Once you download the Navionics app and the charts for the areas you will be using it, the app does NOT USE DATA during normal use.
So if you download the app and the charts on wifi or in the USA using the app in Canada WILL NOT use data.
Your phone has a built in GPS receiver and uses that for location, speed, etc. Turn data off when roaming on your phone, putting your phone in airplane mode also disables the GPS receiver and you need that to get GPS location.
I have used my Navionics app in Florida, Zanzibar and Costa Rica with no roam charges.
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