What does the "DO NOT USE FOR NAVIGATION" indication mean? Sometimes when I'm browsing IAC charts online I find a "DO NOT USE FOR NAVIGATION" notice printed on the chart. Not always though.

For example, have a look at the chart for Queenstown RNAV (RNP) Y RWY 05.
See the notice there?



I have always wondered why do procedure designers put these notices on their charts. I find it almost contradictory, since I think these charts are the best source of information that an aircrew can have to navigate/maneuver. Isn't it ironic?

I'm sure I must be missing something.

Can anybody shed some light on this?

PS: These are not SIM charts. These are real charts from the AIP.
Unless it's an obsoleted procedure chart, it usually means that it's not complete.  The example you show has only the features pertinent to that approach, and its missing (for clarity) the features needed for any other aviation in that area.

You must use a sufficiently complete chart for navigation; the approach diagram is supplementary to your navigation chart.