Does a UPS scanner use GPS to find houses with shared addresses?

Sometimes they leave the house number off and then they dont know where the leave the package. Somehow this isn't discovered until it's out for delivery. Like my house with say something like 6022 and then it will have lot #1-4 as four houses all share the same 6022 number and just have a different lot number. Kind of like a unit number on an apartment complex. It really confuses the ups driver.. sometimes they just send the package back. My question is what is on that little scanner thing they always have in their hand? isn't it a gps map showing where each property is?

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Also, why dont they just call me? That's what fedex does. Seems way faster than driving to the same place two or three times before finally delivering the package
Does a UPS scanner use GPS to find houses with shared addresses?
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