Hi Tim,
Do you have an example? I have checked the RTT NDB between XP10, 11 and 12 current AIRAC cycle 2213 but there is no elevation in any of the three datasets.
As we have written above, it depends on the country if they offer the facility elevation or not - it´s not mandatory. I have checked our source (2213) - we have in total 2734 NDBs in our database and 967 NDBs have an elevation and the rest not …
About the question why this information is suppressed in XP11/12 - this should be asked Laminar Research because since XP11/12 we use a own library/parser for these two datasets. Sorry, but I can´t answer this question.
Cheers,
Richard