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This device is used by fixers to transfer their physical body (but not equipment) almost completely into the Grid, yet retain a presence in the real world. The link between the Grid and reality is maintained by a Multi-Spatial Phasing Beacon. What is left of the fixer in the real world is a semi-solid web of energy that the fixer controls as easily as they would their own body. When in this state, the only way the fixer can be damaged is if the Multi-Spatial Phasing Beacon is itself damaged, which hovers in the center of the energy web. A symbiotic link is maintained between the fixer and the Beacon while this device is worn - if the Beacon is destroyed, the fixer will die. However, given the small size of the Beacon, the majority of attacks tend to be avoided.
The grid is something that is exclusive to RK, there is no grid in SL, therefore the only feasible way GA would make any sense would be if the Beacon was also capable of creating a permanent rift through SL into the RK subspace. You could then argue that if such tech was possible to use on the move, why the need for Jobe to maintain a permanent portal would exist as everyone would have easy and simple access to the Shadowlands at any moment in time.