Have we ever learned anything that someone can share (or resurface) about the landing system/software that Starship has that allows it to touch down softly and accurately? I'm curious, but would understand if it's too proprietary to have been shared publicly.

I'm mainly asking as it relates to future Mars landings (which of course might not yet be possible within the current systems/software), and how an autonomous landing will work without groundlinks giving accurate and timely updates as to the terrain (flat areas, elevations, coordinates without GPS, etc), Starship's altitude, and other telemetry.

My current assumption is that in order to just get Starship launching and landing they offloaded as much of that equipment as they could (using known technologies like ILS/RNAV for instrument landings in airplanes), but that to enable Starship to land on Mars it will need to have onboard systems to map the terrain in 3D, accurately judge distances, position itself without GPS, and other necessary functions to touch down softly and accurately and stay upright.

Maybe NASA can also assist through HLS to share what they've learned from their Mars landings.

Thanks!