What is this mod called? Both syndicate and the diamond minecart.
It is a mod that helps you teleport to places quickly with "waypoints".
The menu looks like this:
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This mod is called VoxelMap. In addition to adding waypoints, it also adds a minimap to the top right corner of the screen, including a radar of mobs (all configurable).
It certainly is Voxelmap but these days it requires lightloader or something.