Mapping - Locate Asset/Defect
You can set the latitude and longitude of point-based Assets (and Defects). Here's the form for a point-based Custom Asset:

Usually, this information is set using the mobile app. However, sometimes mobile device location services may not be available onsite. As an alternative, you can use the Locate Mode mapping feature in AssetAsyst. Underneath, the Latitude and Longitude fields, there's a Locate button:

Clicking the button will put the map into Locate Mode. A marker shows you where the current point is:

Clicking anywhere on the map will change the position of the marker and update the GPS location of the Asset:

To keep the new location (and end Locate Mode) click the Save button. Likewise you can go back to the old GPS location by clicking Revert.
NB - clicking Finish or clicking on any of the other buttons in the map toolbar will end Locate Mode. But you'll still need to click on either Save or Revert.