diff --git a/Nasal/canvas/map/navdisplay.mfd b/Nasal/canvas/map/navdisplay.mfd
index 42d5cdb30..6a76e2848 100644
--- a/Nasal/canvas/map/navdisplay.mfd
+++ b/Nasal/canvas/map/navdisplay.mfd
@@ -52,7 +52,7 @@ NDSourceDriver.new = func {
 	};
 	m.get_lat= func getprop("/position/latitude-deg");
 	m.get_lon= func getprop("/position/longitude-deg");
-	m.get_spd= func getprop("/velocities/airspeed-kt");
+	m.get_spd= func getprop("/instrumentation/airspeed-indicator/true-speed-kt");
 	m.get_gnd_spd= func getprop("/velocities/groundspeed-kt");
 	m.get_vspd= func getprop("/velocities/vertical-speed-fps");
 	return m;
diff --git a/Nasal/canvas/map/navdisplay.styles b/Nasal/canvas/map/navdisplay.styles
index 1e52c946e..3667e1f3e 100644
--- a/Nasal/canvas/map/navdisplay.styles
+++ b/Nasal/canvas/map/navdisplay.styles
@@ -203,7 +203,7 @@ var NDStyles = {
 					init: func(nd,symbol),
 					predicate: func(nd) nd.aircraft_source.get_spd() > 100,
 					is_true: func(nd) {
-						nd.symbols.tas.setText(sprintf("%3.0f",getprop("/velocities/airspeed-kt") ));
+						nd.symbols.tas.setText(sprintf("%3.0f",nd.aircraft_source.get_spd() ));
 						nd.symbols.tas.show();
 					},
 					is_false: func(nd) nd.symbols.tas.hide(),