To display Community Edits on your Navionics Mobile App you have to mark or enable the "Community Edits" option from the Settings section of the app Menu.
Community Edits are downloaded the first time you get chart details by either manually downloading a map or zooming into an area.
Supposing you have already downloaded the map of a certain area you will get an update of Community Edits when you go back in that area. At that time it will start a timer for which the refresh rate will happen automatically every xxx minutes.
Mobile: HELP - INDEX
Find an outline of different features and functions available within the mobile app