The game's built-in distance estimation visible on the power bar does not account for verticality. BetterDistanceEstimation does.
It's a small change: when the player and flag are at different heights, the height of the flag is used as the ground height for points that are closer to the flag than to the player.
Fix bugginess from last update if you point away from the flag
Fix inaccuracy near the cliff between the player and flag that created visible seam lines