What is it ?
Classification is based an APP-6 for NATO classification see wikipedia article.

LotAtc only use a subset of this classification. It will be enhanced in the future.
How I use it ?
Depending of LotAtc Server/Generator settings, item can be auto-classified or not. In all cases, you can change it in selection’s properties or by right+click on any item.
The selection/object panel shows the full classification of the unit (classification, dimension and sub-dimension), not only the top-level value.
Tip: in the classification picker, double-click on a value to apply it immediately and close the picker — useful for quick re-classifications during a busy session.
Filter by classification on the map
The Map panel can filter what is displayed by classification. From LotAtc 2.7 onwards the filter is multi-select: tick several classifications to show all of them at once, and refine by sub-dimension to narrow down to (for example) only fighters or only helicopters within the air dimension.
Filter sets can be saved as presets and switched on the fly from the Map panel — handy if you flip between radar views (general picture, BVR sweep, ground-only, …). Presets are part of LotAtc Advanced.
Transponder format
As described in transponder part, you can associate a transponder code to a classification. Available fields are.
Correct format is:
"classification": {
"classification": "friend",
"dimension": "air",
"sub_dimension": "fighter"
}
Fields are optional, you can only define classification field with no dimension.
Classification
| Id | Description |
|---|---|
| unknown | Unknown |
| assumed_friend | Assumed Friend |
| friend | Friend |
| neutral | Neutral |
| suspect | Suspect |
| hostile | Hostile |
Dimension
Possible values are:
| Dimension id | Subdimension id | Description |
|---|---|---|
| unknown | Pending | |
| unknown | Pending/Unknown | |
| air | Air | |
| unknown | Air/Unknown | |
| fighter | Air/Fighter | |
| fighter_bomber | Air/Fighter/Bomber | |
| bomber | Air/Bomber | |
| tanker | Air/Tanker | |
| sead | Air/SEAD | |
| escort | Air/Escort | |
| aew | Air/AEW | |
| rotary_wing | Air/Rotary-wing | |
| uav | Air/UAV | |
| patrol | Air/Patrol | |
| reco | Air/Reconnaissance | |
| attack_strike | Air/Attack/Strike | |
| csar | Air/CSAR | |
| sar | Air/SAR | |
| cargo | Air/Cargo | |
| land_unit | Land unit | |
| unknown | Land unit/Unknown | |
| combat | Land unit/Combat | |
| ew | Land unit/EW | |
| special_force | Land unit/Special forces | |
| sea_surface | Sea surface | |
| unknown | Sea surface/Unknown | |
| carrier | Sea surface/Carrier | |
| cruiser | Sea surface/Cruiser | |
| destroyer | Sea surface/Destroyer | |
| frigate | Sea surface/Frigate | |
| corvette | Sea surface/Corvette | |
| civilian | Sea surface/Civilian | |
| own_ship | Sea surface/Own Ship | |
| land_installation | Land installation | |
| unknown | Land installation/Unknown | |
| air_defense_missile | Land installation/Air defense missile launcher | |
| air_base | Land installation/Air base | |
| radar | Land installation/Radar | |
| ammunition | Land installation/Ammunition | |
| naval_base | Land installation/Naval base | |
| sea_subsurface | Sea subsurface | |
| unknown | Sea subsurface/Unknown | |
| submarine | Sea subsurface/Submarine | |
| activity_event | Activity/Event | |
| unknown | Activity/Event/Unknown | |
| air_civil | Civil Air | |
| unknown | Civil Air/Unknown | |
| sea_surface_civil | Civil Surface Air | |
| unknown | Civil Surface Air/Unknown | |
| land_civil | Civil Land | |
| unknown | Civil Land/Unknown |