+ mag_var_node(fgGetNode("/environment/magnetic-variation-deg", true)),
+ p_latitude(fgGetNode("/position/latitude-deg", true)),
+ p_longitude(fgGetNode("/position/longitude-deg", true)),
+ p_alt_node(fgGetNode("/position/altitude-ft", true)),
+ p_altitude(fgGetNode("/steam/altitude-ft", true)),
+ p_altitude_agl(fgGetNode("/position/altitude-agl-ft", true)),
+ egt0_node(fgGetNode("/engines/engine/egt-degf", true)),
+ egt1_node(fgGetNode("/engines/engine[1]/egt-degf", true)),
+ egt2_node(fgGetNode("/engines/engine[2]/egt-degf", true)),
+ egt3_node(fgGetNode("/engines/engine[3]/egt-degf", true)),