1.21.1 Compatibility

Compatibility

Version Parity: Signal Radar is fully compatible with modern modding ecosystems on both Minecraft 1.20.1 (Forge) and Minecraft 1.21.1 (NeoForge).

Signal Radar requires only Forge (1.20.1) or NeoForge (1.21.1). Every mod below is optional, detected safely at runtime, and never bundled. Removing an optional mod from an existing world simply drops its corresponding addon from radar slots without errors.

Mod	Version	Supported Features
Manhole Travel	1.7.3+ (1.20.1) / 1.7+ (1.21.1)	The Manhole addon: scans nearby manholes across the dimension (also in unloaded chunks). In 1.20.1, all manholes (unopened, home, open) are visible with their appearance icon.
Lootr	1.20.1 / 1.21.1	The Lootr addon: Lootr containers and cart chests you have not opened yet (team aware). Opening one clears it from the radar. (Tip: set addons.container.includeLootrContainers = false to avoid duplicates).
FTB Teams	Architectury 1.20.1 / 1.21.1	The Team addon: displays online teammates (excluding yourself) across the dimension with normal position fuzz.
KubeJS	KubeJS 6 (1.20.1) / KubeJS 7 (1.21.1)	Scripting events, SignalRadar binding, narrative found stages, and startup custom addons: KubeJS, Custom Addons.
JEI	1.20.1 / 1.21.1	Info recipe pages for the radar, upgrade modules, and active addon items.
Chargers (Mekanism, etc.)	1.20.1 / 1.21.1	Standard Forge Energy: ForgeCapabilities.ENERGY on 1.20.1 Forge, Capabilities.EnergyStorage.ITEM on 1.21.1 NeoForge. Any FE charger works at full speed by default.

Two-handed items

An offhand radar switches off (no scan, no energy use, dark screen, LED off) while the main hand:

• uses a bow, crossbow, spear, spyglass, brush or goat horn, or holds a charged crossbow;
• holds an item in the tag signalradar:two_handed (empty by default: add guns and other two-handed mod items; optional entries are fine);
• on the client, also when the main-hand item reports a two-handed arm pose.

The main-hand radar is never affected, and the offhand radar resumes on its normal schedule without an extra paid scan.

Resource packs

Tags, targets and recipes are data (datapacks or KubeJS). The radar screen rectangle is read from assets/signalradar/radar_screen.json, so a resource pack can restyle the model. See also Display and Controls.