A current owner can tell from the Satellite Status Page, NAV page #5. STATUS should show either 2D Navigation or 3D Navigation. Which is it ?
Great catch, and great question. I don’t have my GNS430’s (with SR20 attached) yet - 16 days to go! - but I’d bet that the 2D/3D isn’t fixed. What I mean is, it depends on how many satellites (and in what configuration) it is receiving at any given moment as to whether it CAN provide 3D info or not. At least, that’s how it works on my handheld GPS 295. (By the way, 99% of the time, it is in 3D mode. Generally speaking, the only time I even see 2D is shortly after power-up, while it is still acquiring satellites.)
Here’s what the GNS 430 manual says on the subject:
2D Navigation – The GPS receiver is in 2D navigation mode. Altitude data will be provided by an altitude serializer.
3D Navigation – The GPS receiver is is 3D navigation mode and will compute altitude using satellite data.
It could be that somewhere in the GNS 430 is a menu item to FORCE 2D mode, and thereby force the use of the serializer. I don’t know; I also don’t know if we even HAVE a serializer; or is the serializer part of the GPS?
Clyde, other owners: What’s the real answer?