To start the datapack:
1, extract the "simplecoords" folder into the world folder
2, use the /reload command
3, an operator must use /function simplecoords:setup
4, any player who wants to see the coords must then type /trigger SCOn set 1 (or 0 to turn if off)

The datapack is multiplayer friendly, and gives each player their own overworld and nether coordinates in either of those dimensions, the end coordinates in the end, as well as the facing

In the overworld, the current coordinates are shown in green, and your nether coordinates are shown in red, the nether coordinates are scaled down by a factor of 8.

In the nether, your current coordinates are red, and the overworld coordinates are green, and are scaled up by a factor of 8.

In the end, you only have your current coordinates in yellow

Next to your current coordinates is your chunk coordinates in brackets. This is mainly helpful for finding slime chunks in the overworld with amidst and such.

Next to your facing is the direction of the axis you're facing. for example, northwest is negative x and negative z, so if you were to walk in that direction both your x and z coordiantes would decrease.

The pack now also shows time in a 24H clock while in the overworld too.