Transponder

From Horizon's End Wiki

Transponders are a feature introduced in the Dominion Update in conjunction with new stealth mechanics. Before the update, all players holding controller and/or piloting ships were visible to all players on the Dynmap, which made players exceptionally vulnerable if they were unable to protect themselves from Pirates or enemy Nations. The transponder serves as a toggle for this old feature, allowing players to selectively appear on the map if they so choose. /transponder is a simple toggle command to enable or disable the transponder. Alternatively, there is a Transponder toggle in the /settings menu.

When enabled, the player is ALWAYS visible on the map, even when they are not piloting a starship or holding their controller. This can prove dangerous if a player doesn't have new player protection or is in a deep space system where protection doesn't apply regardless. This also bypasses the Recon's ability to not appear on the dynmap. As such, it's generally recommended to disable the transponder once you understand how intragalactic navigation works.

When disabled, the player is ONLY visible on the map when combat tagged in PVP, or near gates between Core Systems. While doing so, any ship they are piloting or have unpiloted since being combat tagged is also visible until the combat tag timer runs out.