GMAP Marker Field always defaults to none when editing

I'm not sure if this is the correct way to do it and in fact, it probably isn't. HOWEVER, I have modified the code in the file gmap/gmap_fields/gmap_fields.module starting at line 69:

/**
 * Implements hook_field_widget_form_alter().
 */
function gmap_fields_field_widget_form_alter(&$element, &$form_state, $context) {  
  if ($context['field']['type'] == GMAP_FIELDS_TYPE_MARKER) {
    $element['#options'] += gmap_get_marker_titles();
    $element["#default_value"] = _gmap_fields_default_field_value($context);
  }
}

/**
 * Get the default value helper function
 */
function _gmap_fields_default_field_value($context) {
  if(isset($context['delta'])) {
    $delta = $context['delta'];
    return $context['items'][$delta]['value'];
  }
  return NULL;
}

It works for me but that's only when the field is limited to one value, but that's solving my issue at the moment. I will probably have to alter it later.

Thanks Nathan!