It isn't a map drawn again: it's the rooms of the game's own map, each in its area's colour, taken from its files. On it, Hornet at the bench you rest at and a dot for each piece you're missing in its room: Mask Shards, Spool Fragments, Memory Lockets, Craftmetal, Pale Oil and fleas. Without a save, all of them, as a guide.
Open the map ›On Windows, in %USERPROFILE%\AppData\LocalLow\Team Cherry\Hollow Knight Silksong; on macOS, in ~/Library/Application Support/unity.Team-Cherry.Silksong; on Linux and Steam Deck, in ~/.config/unity3d/Team Cherry/Hollow Knight Silksong. Inside, a folder named with a number and the files user1.dat to user4.dat. The site walks you through it when importing.
Free, no account and no ads. Your save never leaves your browser: it's read there and kept there.