This will depend on the type of procedure you are reflecting on the IAC.
If its a PBN one it will be using the Aerodrome magnetic declination
If its a conventional it will depend on the navaid, sometimes it is very problematic as in the same chart you may have 2 or more navaids each one calibrated with different declinations, you should be using the one used for most of the procedure and for sure the one providing the final track.
I think it would be better if the navaids are all adjusted to have similar declination information for the year and location so its 2020 (time for the 5 year review). In the case of the navaid this would really just be a case for the VOR as the NDB and LOC for ILS uses the aerodrome one
Here is an extract from PANS OPS DOC 8168 Vol II and another reason this information is provided to you by the procedure designer
Nothing worst than having to track a magnetic declination from 10-15 years ago.
This will depend on the type of procedure you are reflecting on the IAC.
If its a PBN one it will be using the Aerodrome magnetic declination
If its a conventional it will depend on the navaid, sometimes it is very problematic as in the same chart you may have 2 or more navaids each one calibrated with different declinations, you should be using the one used for most of the procedure and for sure the one providing the final track.
I think it would be better if the navaids are all adjusted to have similar declination information for the year and location so its 2020 (time for the 5 year review). In the case of the navaid this would really just be a case for the VOR as the NDB and LOC for ILS uses the aerodrome one
Here is an extract from PANS OPS DOC 8168 Vol II and another reason this information is provided to you by the procedure designer
Nothing worst than having to track a magnetic declination from 10-15 years ago.