Navionics Boating App…
I found this over here…
https://support.garmin.com/en-ZA/?fa...GPS%20receiver)
Navionics Boating App Features, Online vs Offline
“There are several features within your Navionics® Boating app that require an active internet (Cellular or Wi-Fi) connection.
Chart downloads and updates (GOVT charts, Nautical Chart, SonarChart™)
Downloadable map overlays (Relief Shading, Satellite Imagery, Sonar Imagery)
Sync My Data (to connect to your account on our server)1
Upload sonar
logs (with
Raymarine Plotter Sync)
Map overlay (Bing Satellite or Terrain)
Weather data (excluding tide and
current data, which is part of downloaded charts)
Sharing saved items (tracks/routes/markers)
Sharing live location with Connections
When offline (no Wi-Fi or Cellular coverage) you will be able to access the following:
Previously downloaded chart detail (GOVT, Navionics Nautical Chart and SonarChart)
Previously downloaded map overlays (Relief Shading, Satellite Imagery, Sonar Imagery)
GPS position1 (if your device has an internal
GPS receiver)
Save tracks, markers, routes, photos and videos1
SonarChart Live1 ( view compatibility information)
Plotter Sync (route and marker sync and chart updates)
1 Free features. All other features require an active subscription.”
However I cannot seem to get sat imagery when offline. Otherwise it works fine. It has never asked me to validate something or stopped working, but then again I am not offline for long periods, week at most. I have had it freeze on my device a few times when opening the app(ipad and iphone) but that has not happened in awhile.