fixed some more bugs

src/app/map/map.component.ts

@@ -37,9 +37,7 @@ export class MapComponent {
                 duration: 5000,
                 panelClass: 'bg-warning,text-white'
             }).onAction().subscribe(() => this.calibrate());
-        })
-
-        physicsService.requireCalibration.emit();
+        });
     }
 
     mapReady(map) {
@@ -51,6 +49,7 @@ export class MapComponent {
         liveCalibration.subscribe(calibration => this.physicsService.calibrate = calibration);
         this.bottomSheet.open(CalibtrateComponent, {
             hasBackdrop: false,
+            disableClose: true,
             data: {
                 in: this.physicsService.info.pipe(map(coords => coords.heading)),
                 out: liveCalibration

src/app/physics/physics.service.ts

@@ -51,7 +51,7 @@ export class PhysicsService {
                 speed: data[0].coords.speed
             };
 
-            if(info.heading == null && !!data[1]) {
+            if(info.heading == null && !!data[1] && data[1].alpha) {
                 if(!data[1].absolute && this.calibrate == null) this.requireCalibration.emit();
                 this.calibrate = 0;
                 info.heading = data[1].alpha + this.calibrate;