Read the distance traveled between planets. Based on Quezler's "Read belt contents, hold (all belts), read belt length" mod: https://mods.factorio.com/mod/read-belt-contents-hold-all-belts-read-belt-count Thumbnail photo by Kirk K. (@mmmyoso). Licenced under Creative Commons CC BY-NC-ND 2.0: https://www.flickr.com/photos/mmm-yoso/8253268543
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.