Terrain following with custom terrain grids?

I was thinking of flying more complex terrain using terrain following and save myself the headache of always planning in absolute elevation for missions. The SRTM data in some areas are no longer accurate even within 40m. If I have a geotiff elevation grid loaded into Mission Planner’s SRTM fold, would that elevation data be loaded onto the cube’s micro sd card for terrain following? Or will it still use SRTM?

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