Hello,
OpenStreetMaps
d_coord_lat
d_coord_long
-----------
Radius Search
 latitude
 longitude
 Is it reasonable to have separate input fields for latitude and longitude when adding a listing?
 It should ideally be a single input field for both. Here, the entered data is one, with different table names.
How can the input fields be merged on the item post page?

2 fields, 2 inputs, generally hidden for users

2 fields, 2 inputs, generally hidden for users

The two fields have been added
<input type="" class="rad_search" name="sLat">
<input type="" class="rad_search" name="sLon">But the data is not added to the database

Name in inputs is naturally wrong.