Terrain Following missions

when doing a Terrain Following mission how much space does it take on the SD card
do we need to fit bigger SD card if so what size.
by end of the days flying theses few logs on the SD card
can i load a mission with way points when not at the flying area will it load the Terrain maps of that area
i have no cell access so have to do it at home

I think it depends on the resolution of the DEM (Terrain_Spacing). I have set it to 100, what is the default value. The file on the card has 2 MB and is named “N53E12” so i think it covers one degree in the coordinate system, what means in this case 66 * 111 km. So I think you don´t have to worry about space on the card.