Intention

Show player position on the map for those of us who play the game on one monitor and have the fistshake map open on another monitor.

Step 1: BepInEx

If you haven't already, set up BepInEx.
Ref. https://planet-crafter.fandom.com/wiki/Modding#Installation

Step 2: Mod

Extract fistshake.zip to ..\BepInEx\plugins\

Step 3: Get ID

Double-click the coordinates in the bottom left of the fistshake map to copy your ID.

Depending on your browser, you might have to allow it to do so.

Step 4: Paste ID

Paste the ID to the mod ingame.

Step 5: Test

When you click Test, a marker should appear on the fistshake map.
It will pulse once to indicate success.

Note 1: Invalidate ID

If you refresh the map (i.e. F5 or by changing planet manually) the ID will invalidate.
Just get and paste a new one, as shown in step 3 and 4.

Note 2: Hide ID

This toggle is for those of you who stream the game.
It has no functionality other than masking the ID.

Note 3: Browser restrictions

This service uses websockets. It may or may not work with browsers like Brave etc.