diff --git a/src/app/modules/map/ol/lib/navigation/layer-bearing-line.component.ts b/src/app/modules/map/ol/lib/navigation/layer-bearing-line.component.ts
index 67a4c593..d99ed9d0 100644
--- a/src/app/modules/map/ol/lib/navigation/layer-bearing-line.component.ts
+++ b/src/app/modules/map/ol/lib/navigation/layer-bearing-line.component.ts
@@ -237,7 +237,7 @@ export class BearingLineComponent implements OnInit, OnDestroy, OnChanges {
   // update feature labels
   updateLabel(f?: Feature) {
     if (!f && this.source) {
-      f = this.source.getFeatureById('d.base');
+      f = (this.source.getFeatureById('d.base') as Feature);
     }
     const s: StyleLike = f.getStyle();
     if (!s) {
diff --git a/src/app/modules/map/ol/lib/resources/layer-sktarget-tracks.component.ts b/src/app/modules/map/ol/lib/resources/layer-sktarget-tracks.component.ts
index 7fa8e18c..4a628c05 100644
--- a/src/app/modules/map/ol/lib/resources/layer-sktarget-tracks.component.ts
+++ b/src/app/modules/map/ol/lib/resources/layer-sktarget-tracks.component.ts
@@ -164,7 +164,7 @@ export class SKTargetTracksLayerComponent
       if (this.tracks.has(w)) {
         const target = this.tracks.get(w);
         // ** target **
-        let f = this.source.getFeatureById('track-' + w);
+        let f = (this.source.getFeatureById('track-' + w) as Feature);
         if (f) {
           // exists so update it
           f.setGeometry(new MultiLineString(this.parseCoordinates(target)));
@@ -191,7 +191,7 @@ export class SKTargetTracksLayerComponent
       return;
     }
     ids.forEach((w) => {
-      const f = this.source.getFeatureById('track-' + w);
+      const f = (this.source.getFeatureById('track-' + w) as Feature);
       if (f) {
         this.source.removeFeature(f);
       }
diff --git a/src/app/modules/map/ol/lib/resources/layer-sktargets.component.ts b/src/app/modules/map/ol/lib/resources/layer-sktargets.component.ts
index 09788c01..6a2e247e 100644
--- a/src/app/modules/map/ol/lib/resources/layer-sktargets.component.ts
+++ b/src/app/modules/map/ol/lib/resources/layer-sktargets.component.ts
@@ -182,7 +182,7 @@ export class SKTargetsLayerComponent implements OnInit, OnDestroy, OnChanges {
       if (this.targets.has(w)) {
         const target = this.targets.get(w);
         // ** target **
-        let f = this.source.getFeatureById(w);
+        let f = (this.source.getFeatureById(w) as Feature);
         if (f) {
           // exists so update it
           if (target.position) {
@@ -221,7 +221,7 @@ export class SKTargetsLayerComponent implements OnInit, OnDestroy, OnChanges {
       if (this.targetType && w.indexOf(this.targetType) !== 0) {
         return;
       }
-      const f = this.source.getFeatureById(w);
+      const f = (this.source.getFeatureById(w) as Feature);
       if (f) {
         this.source.removeFeature(f);
       }
diff --git a/src/app/modules/map/ol/lib/resources/layer-skvessels.component.ts b/src/app/modules/map/ol/lib/resources/layer-skvessels.component.ts
index 832248c9..c137b3e1 100644
--- a/src/app/modules/map/ol/lib/resources/layer-skvessels.component.ts
+++ b/src/app/modules/map/ol/lib/resources/layer-skvessels.component.ts
@@ -234,7 +234,7 @@ export class SKVesselsLayerComponent implements OnInit, OnDestroy, OnChanges {
       if (this.targets.has(w)) {
         const target = this.targets.get(w);
         // ** target **
-        let f = this.source.getFeatureById('ais-' + w);
+        let f = (this.source.getFeatureById('ais-' + w) as Feature);
         if (f) {
           // exists so update it
           if (this.okToRender(w) && target.position) {
@@ -287,7 +287,7 @@ export class SKVesselsLayerComponent implements OnInit, OnDestroy, OnChanges {
       return;
     }
 
-    let wf = this.source.getFeatureById('wind-' + id);
+    let wf = (this.source.getFeatureById('wind-' + id) as Feature);
     if (!this.okToRender(id, true) || !target.position) {
       if (wf) {
         this.source.removeFeature(wf);
@@ -326,11 +326,11 @@ export class SKVesselsLayerComponent implements OnInit, OnDestroy, OnChanges {
       return;
     }
     ids.forEach((w) => {
-      let f = this.source.getFeatureById('ais-' + w);
+      let f = (this.source.getFeatureById('ais-' + w) as Feature);
       if (f) {
         this.source.removeFeature(f);
       }
-      f = this.source.getFeatureById('wind-' + w);
+      f = (this.source.getFeatureById('wind-' + w) as Feature);
       if (f) {
         this.source.removeFeature(f);
       }
diff --git a/src/app/modules/map/ol/lib/vessel/layer-vessel-trail.component.ts b/src/app/modules/map/ol/lib/vessel/layer-vessel-trail.component.ts
index 1eb968ed..d818e27c 100644
--- a/src/app/modules/map/ol/lib/vessel/layer-vessel-trail.component.ts
+++ b/src/app/modules/map/ol/lib/vessel/layer-vessel-trail.component.ts
@@ -138,7 +138,7 @@ export class VesselTrailComponent implements OnInit, OnDestroy, OnChanges {
       this.trailLocal.setStyle(this.buildStyle('local'));
     } else {
       //update feature
-      this.trailLocal = this.source.getFeatureById('trail.self.local');
+      this.trailLocal = (this.source.getFeatureById('trail.self.local') as Feature);
       if (this.localTrail && Array.isArray(this.localTrail)) {
         const g: Geometry = this.trailLocal.getGeometry();
         (g as LineString).setCoordinates(c);
@@ -160,7 +160,7 @@ export class VesselTrailComponent implements OnInit, OnDestroy, OnChanges {
       this.trailServer.setStyle(this.buildStyle('server'));
     } else {
       //update feature
-      this.trailServer = this.source.getFeatureById('trail.self.server');
+      this.trailServer = (this.source.getFeatureById('trail.self.server') as Feature);
       if (this.serverTrail && Array.isArray(this.serverTrail)) {
         const g: Geometry = this.trailServer.getGeometry();
         (g as MultiLineString).setCoordinates(ca);