It is all in the Brochure... I would have thought people had read it about the GE capabilities
GlobalEye is a multi-domain Airborne Early Warning & Control (AEW&C) solution. With its mix of modern active and passive sensors, it provides long-range detection and identification of objects in air, at sea and over land.
www.saab.com
If you scroll down to the Domain Capabilities it clearly states some of its mixed capabilities .
GlobalEye AEW&C | Saab
Its in the brochure page.
This is what makes the GE a suitable aircraft for Canada. It has more then one specific role.