There is a great free miniatures ruleset out there called "Conn..Sonar!" that does a good job of recreating subs hunting each other or targets (otherwise known as surface ships). One of the requirements is for a tracking the target solution on contacts. The game uses markers to track the fidelity of the target solution. The more markers, the more confidence you have in being able to shoot at the target. In any case, I designed this for use with the game. I printed them with the bottom 1mm in white and the top 1mm in various colors to allow each submarine to have their own color.

Printed on a Prusa Mk4 in PLA with a 0.25 nozzle at 0.15mm resolution but I feel like it would also work fine with a 0.40 nozzle at 0.20mm resolution.