The title says it all. Anyway to see your altitude on an RX330?

 

I'd have to say "no". Even the diagnostic screen for the GPS system only shows latitude and longitude. (This thread tells you how to get to that diagnostic screen: https://www.clublexus.com/forums/sho...d.php?t=161057)

The GPS system is techincally capable of it - it will use 3 satellites to compute position, which would give it the altitude. But I've never seen it displayed anywhere.

 

I think it uses the beyond 2 satellites for redundancy not for elevation.

 

You need at least 3 satellites to make a two-dimensional fix on a location. (Even 3 isn't exact, but usually, you can discount the other mathematically-possible locations as physically impossible.) A fourth will give you an exact three-dimensional location. A fifth, if available, is used to verify the timing accuracy of the other 4. Beyond 5, it will pick those 5 with the best signal.

The status display I mentioned in the other post will show you if the car thinks it has a 2D fix, a 3D fix,and how many satellites are in use.