Hello Nate, 

In the Geolocation field options, you can set it to a Default Value of current_location as shown in the image below:

To make the field hidden to the submitter, you can use Javascript to make the Geolocation field hidden on the submitter step using this javascript 

$(document).ready(
  function() {
    if($('input[name="stepid"]').val()==1) {
    	$("#q4").hide();
    }
  });

where the 1 corresponds to the ID of the process event which can be found in the Process Diagram by double clicker a step as shown below:

And  the "#q4" is the id of my geolocation field. 

Hope this helps!