Terrain Following for Copter 3.4.6 with a Rangefinder?

@fireflyer451 wrote:

I am interested in trying an SF10 Rangefinder from Lightwave, to fly with terrain following. What I am not clear about is how the Terrain Following function works when interacting with a MP WP mission using:
1. Select 'Terrain' altitude selection for the WP mission
2. Operating remotely in the field with no Internet access, to download new map SRTM data
3. The SF10 rangefinder

Docs say: "The database is populated automatically by the autopilot requesting terrain data from the ground station over a MAVLink telemetry link. "

Is this required if I use the SF10 to determine height above the ground? If I use the SF10 rangefinder to fly at a specified altitude above the ground, does MP need to send SRTM data via telementry to my copter?

Thanks for any clarifications

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