How to show directions on a map when using the Geolocation Field module
When you download the Get Directions module, it has a README.txt that explains how to set up the module.  Make sure to:

Make sure both modules are enabled, then configure the Get Directions module at: Administer &gt; Site configuration &gt; Get directions.

Go to Administer &gt; User management &gt; Permissions and set up permissions according to your needs.

Configure up a Geolocation field on a content type, then create a node of that type and fill in the field.  You should then be able to use this URL pattern to see Get Directions module work with that node by going to 


  http://{hostname}/getdirections/location/to/{node_id}


or 


  http://{hostname}/getdirections/location/from/{node_id}


where {hostname} and {node_id} are filled in with correct values.

Here is the full section on all the options from the README.txt:


  For instance, if you want to "preload" the getdirections form with information
  about the destination use a URL in this format:
  
  getdirections/location/to/99
  
  Where '99' is the node id (nid) of the location. The user will only
  have to fill in the starting point.
  
  To do it the other way around use getdirections/location/from/99
  
  You can also get a map with waypoints
  getdirections/locations_via/1,2,3,99
  
  If you have both the starting point and destination node ids then you
  can use getdirections/locations/1/99
  
  Where '1' is the starting point node id and 99 is the destination node
  id (note the 's' in locations)