ForeFlight uses two distinct performance engines for calculating flight performance:
-
Cloud-Based Engine (Online Engine):
- Requires an internet connection.
- Calculates performance results for the NavLog and Route/Altitude Advisor.
-
Built-In Engine (Mobile Engine):
- Works offline.
- Calculates performance summaries on the Maps and Flights pages, as well as performance results in the Fuel and Weight Verification sections of the Flights view.
These engines may produce slightly different performance results due to differences in their calculations and data processing. The NavLog and Route/Altitude Advisor are unavailable offline, while other parts of the app (using the mobile engine) will still calculate performance when disconnected.
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