[asmithmd1]

I see a chip marked SIRF - does it have GPS?

[storborg]

It looks that way. The SIRF chip is marked as GSD4e.

http://www.csr.com/products/35/sirfstariv-gsd4e

You can see more detail of that here:

http://www.catwig.com/google-glass-teardown/teardown/mainboa...

[thejosh]

I hope so, as this will enable Google Maps-like functionality.

[tempgoogleglass]

Yes it already has inbuilt GPS unit. Source: I own one

[danellis]

Then why does it need the MyGlass app running for GPS?

[miahi]

Probably for AGPS and a better positioning using both GPS chips and other positioning sensors (cell towers, wifi). The Glass GPS antenna is tiny, it can take ages to synchronize without aid.

[danellis]

"Ages" must mean more than half an hour inside a car, then. If I don't have the MyGlass app running on my phone, the location accuracy is so limited that I can only assume it's based on WiFi.

But what do you mean "without aid"? Even without MyGlass running, Glass still has WiFi-based location and an Internet connection (tethering is separate from MyGlass) -- isn't that sufficient for AGPS?

[vincentkriek]

Battery life I imagine.