SGPropertyNode* fgGetNode (const char * path, bool create) { return 0; }
SGPropertyNode* fgGetNode (const char * path, int i, bool create) { return 0; }
float fgGetFloat (const char * name, float defaultValue) { return 0; }
-float fgGetDouble (const char * name, double defaultValue) { return 0; }
-float fgSetDouble (const char * name, double defaultValue) { return 0; }
+double fgGetDouble (const char * name, double defaultValue = 0.0) { return 0; }
+bool fgSetDouble (const char * name, double defaultValue = 0.0) { return 0; }
static const float RAD2DEG = 57.2957795131;
static const float DEG2RAD = 0.0174532925199;