Location sensor feature can be turned on/off with a simple check box under the SLP/General/User Interface tab.
When the box is checked and a visitor to your site performs a search , SLP queries the browser and requests their current location. If the browser allows location queries it will return their geographic location which will be used to set the default search location.
Note: This will only work with most browsers if you have a secure site or if your site visitor “allows” there location to be visible to you. Google Chrome has had restrictions since Chrome version 50 (released in 2016) that they will only return locations using location sensor if the request is generated within the url of a valid secured site (https://). See the Google developers console for more information.
Location Aware Browsing
Accuracy varies greatly from location to location. In some places, service providers may be able to provide a location to within a few meters. All locations returned by service providers are estimates only and we do not guarantee the accuracy of the locations provided. Your SLP settings also determine the number of locations shown nearest the site visitor. Settings for radius, number of results to return and center of map all interact to show locations nearest to the site visitor.