script panel and voice call out

[pannam]

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The airport that I fly from is at an elevation of 20 feet. So, I put a condition on script panel

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(([INDICATED ALTITUDE] >100 && ([INDICATED ALTITUDE] <110))

then call out a voice command POSITIVE RATE . It works fine for that airport but when I spawn at the different airports at the different elevations I have to keep changing the conditions every time.
I want to write down something like this

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(([INDICATED ALTITUDE] > ([AIRPORT ELEVATION+ 50] ))

then call out positive rate

can you lead me to some documents or example? in short how can I add values to conditions?

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(([INDICATED ALTITUDE + 50))

[c0nnex]

You will need to create an expression for that:
Head to Addons->Expressions and Add an expression (Globa Scoped in your case)
as Expression give
[INDICATED ALTITUDE] + 50

In your Callout Condition reference that newliy created expression as Source Data value.