Does the 2018 Toyota Corolla have GPS?

Yes, Your 2018 Toyota Corolla does, in fact, have GPS. You can use the GPS directly via the in-dash infotainment console, but that'd be pretty tedious. Instead, it's expected that You'll download the Scout GPS Link App from the Apple Store (iPhone) or Google's Play (Android) and put it on Your smartphone. When You've initialized it on there, You'll see a message on Your Corolla's display to update Your Entune system; just touch "now" to start that process. When it's done, You should be connected. Toyota used to charge for this, but has since made apps, Audio, phone and navigation all run under their Entune grouping, subscription free!