BMP388 has operating range of 300hPa ~ 1250hPa which corresponds to 10km or 30000feet above sea level ~ -1.8km or -5926feet below sea level. Please describe a little more about what you want to achieve with BMP388 in your surveillance drone application.
Thank you for your time and for your reply. I am looking for advice for circuitry diagrams that will allow me to trigger a switch or RC signal when a critical altitude is reached by the surveillance drone, either to return to base or hold altitude. Perhaps the BMP 388 is not the appropriate sensor.