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tracernz avatar image
tracernz asked tracernz edited

WASM Facility Subscription Does Not Return Region

I have been working a little with the WASM facility API. I would like to subscribe to all of the VHF navaids in the vicinity of the aircraft, and get some detailed information about them. If I subscribe with `SimConnect_SubscribeToFacilities_EX1`, then I would like to request more detailed information with `SimConnect_RequestFacilityData_EX1` (after having previously set up a VOR definition with all of the data I desire). The problem is that the `SIMCONNECT_DATA_FACILITY_VOR` provided in the list from `SimConnect_SubscribeToFacilities_EX1` does not give the region of the navaid, which I then seemingly require for `SimConnect_RequestFacilityData_EX1` . The documentation suggests that if region is left empty all the of the matching facilities will be returned, but in-fact only a subset of the facilities are returned without a region code. The question is how to call RequestFacilityData using the information given by SubscribeToUtilities?

It would be nice if both `SimConnect_SubscribeToFacilities_EX1` and `SimConnect_RequestFacilityData_EX1` would provide the region, and for terminal navaids also the airport ident. Both of those pieces of information are available in the JS facility API.

I also note an issue in the documentation for the VOR type:


ILS facilities give type 4, not type 6 as the docs suggest, amongst others. Instead the type seems to match the vorClass type in the JS API (

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Arzop avatar image
Arzop answered tracernz edited


Can you check in the Icao field, both information should be in there.

This is a char[9] field where:

  • Ident is located from 0 to 5
  • Region is located from 6 to 9

Best Regards

Maxile / Asobo

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tracernz avatar image tracernz commented ·

Ah, that makes a lot of sense, and yes, it does work for VORs.

For ILS/LOC the region is empty (as in JS API as well... they are attached to an airport instead). I can retrieve the VOR/DME navaids fine now with RequestFacilityData using that region encoded in the Icao, but ILS/LOC with blank region do not work... I get an empty list back. If I hardcode the region in my RequestFacilityData call for those, I do receive them.

Using the region encoded in Icao field of SubscribeToFacilityData result list, ILS (IDN, IMN) returns empty result:
1673942065224.pngIf I hardcode the region in my RequestFacilityData call to NZ the ILS are succesfull:


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