People have poked fun at Gmail's eternal beta status, but it makes sense with an interface that is constantly in evolution.
On Android based phones, you don't have to wait for operating system updates pushed to the phone to try new features in development.
Currently in the Navigation are labs for a scale bar, terrain overlay, popular categories, a layering button and compass arrow.
You can access labs navigation by accessing "More" from the menu key.
If you like the YouTube embed lab in Google talk chat in the web interface, it's also part of the Android Google talk chat on the phone, embedding a thumbnail and quick link.
As stated by Google, "Labs is a testing ground for experimental features" giving you a chance to see what the developers are working on for future updates.
"They may change, break or disappear at any time."
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