Lodestone Locator
Placing a down lodestone will make a waypoint in the player locator bar
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Lodestone Locator
Lodestone Locator

Minecraft have recently released version 1.21.6, this update has the player locator bar. But it ONLY locates players, it has so much potential to be a VANILLA waypoint system.
Functionality
Whenever you place down a lodestone, another waypoint will become visible in the bar. You may change the color of this by putting carpets ontop of it, or just make it invisible by putting a carved pumpkin ontop.

Players may make the player icon a "distance" type thing by placing a moss/pale moss carpet on the lodestone. These will make the waypoint have a 1000 block and 500 block distance respectfully.