Hello:

I am hoping someone can explain the syntax I find throughout the lists of SimVars and events. In particular, but only as an example:

Code: Select all

```
AP_ALT_VAR_DEC
[0]: New reference altitude
[1]: Index
```

What is confusing me is this: the event decrements the reference altitude - so, what is the reference altitude - is it the altitude Hold altitude? if so, I presume it decrements the hold altitude but by how much? Secondly, how do the [0] and [1] come into play? And finally, a couple of examples (they don't have to ones you've used), just enought so I can figure out how to use it.

As always, I appreciate all the information everyone is kind enough to share with me!

Sparky