SGPropertyNode *node = fgGetNode(branch.c_str(), num, true );
if( NULL == (_offset_node = node->getChild("offset-deg", 0, false)) ) {
_offset_node = node->getChild("offset-deg", 0, true);
SGPropertyNode *node = fgGetNode(branch.c_str(), num, true );
if( NULL == (_offset_node = node->getChild("offset-deg", 0, false)) ) {
_offset_node = node->getChild("offset-deg", 0, true);