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You may insert a map on top of your navbar through the header widgets. You can enabled the header widget area in X > Launch > Options > Widget Bar. Simply choose "One" and insert a text widget along with your Google Map code for the header widget.
If you truly want to insert the Google Map as a replacement of the slider, it will only be possible with custom development. Please keep in mind the custom development is beyond the scope of our support.
Meanwhile, if you switch to Pro theme, anything is possible. You can easily create your custom header and be able to insert a Google map right above your menu bar. You should also think twice first before switching to Pro theme because Pro theme is for intermediate and advanced users, designers and developers unlike X which is just for beginners and intermediate users.
If you want to know more about Pro theme and the header builder, please check this out:
Hope this helps.