node/add/nodetype: Default lat/lon-values by modifying $form

This is easily applied to other fields by modifying the default values of the node/add/nodetype $form.

But where in the $form array are the default values for the locations?

I have tried multiple solutions, but none seems to work. Some even changes the default value -> in the array,
but still, the node form are not showing the inserted new values from the array.

Now Im stuck.

Ive found a a solution to this (a hack, but still). For reference:
#143289: Pre-populate node location from author/organic group etc. comment no #7.
This hack enables locations to be set at user's location.

I need to be able to create nodes with lat/lon inherited from previous node.
If no node to inherit from, the location needs to be set at the user's location (users only post nodes to their immediate area)

The easiest way is to check for a node id in arg(3) after node/add/nodetype/ to inherit from.
So i replaced ron_s's first part with this:

<?php
	if (!is_numeric(arg(3))){
		global $user;  
  		$user_location = location_load_locations($user->uid, 'uid'); 
  	} elseif (is_numeric(arg(3))) {
  		$user_location = location_load_locations(arg(3), 'nid');
  	};
?>

Then I used the last part as it was.