diff --git a/src/hud/index.ts b/src/hud/index.ts
index 16aaaae..c39d9be 100644
--- a/src/hud/index.ts
+++ b/src/hud/index.ts
@@ -23,12 +23,15 @@ function showAttribution (visible: true) {
   if (attributionElem) {
     if (visible) {
       const satelliteStore = viewer.getSatelliteStore();
-      if (satelliteStore && satelliteStore.getAttribution()) {
-        const attribution = satelliteStore.getAttribution() || {};
+      if (satelliteStore?.getAttribution()) {
+        const attribution = satelliteStore.getAttribution();
         const updatedDate = satelliteStore.getUpdatedDate();
-        attributionElem.innerHTML = `Orbital object data from <a href="${attribution.url}">${attribution.name}</a> <span class="updated">(updated ${updatedDate})</span>`;
+
+        if (attribution) {
+          attributionElem.innerHTML = `Orbital object data from <a href="${attribution.url}">${attribution.name}</a> <span class="updated">(updated ${updatedDate})</span>`;
+          attributionElem.classList.remove('hidden');
+        }
       }
-      attributionElem.classList.remove('hidden');
     } else {
       attributionElem.classList.add('hidden');
     }
@@ -274,12 +277,12 @@ function getSupportedEvents () {
 }
 
 function initMenus () {
-  const elements = document.querySelectorAll('.menu-item');
-  for (let i = 0; i < elements.length; i++) {
-    const element = elements[i] as HTMLElement;
+  const elements = Array.from(document.querySelectorAll('.menu-item'));
+
+  for (const element of elements) {
     element.addEventListener('click', () => {
-      const action = element.dataset.action;
-      if (action && action.startsWith('open:')) {
+      const action = (element as HTMLElement).dataset.action;
+      if (action?.startsWith('open:')) {
         const parts = action.split(':');
         windowManager.openWindow(parts[1]);
       }
diff --git a/src/utils/logger.ts b/src/utils/logger.ts
index 14ab4c9..f38a015 100644
--- a/src/utils/logger.ts
+++ b/src/utils/logger.ts
@@ -3,7 +3,12 @@
 const defaultLogLevel = 'debug';
 const logLevels = ['error', 'warn', 'info', 'debug'];
 
-let allOutputs: Record<string, any> = {};
+let allOutputs = {
+  error: (..._args: any) => {},
+  warn: (..._args: any) => {},
+  info: (..._args: any) => {},
+  debug: (..._args: any) => {}
+};
 let globalLogger = new Proxy({
   logLevel: defaultLogLevel,
   enabledOutputs: {} as Record<string, any>,
@@ -41,8 +46,8 @@ function init () {
 
   const enabledOutputs = scope.enabledOutputs;
 
-  for (let i = 0; i < logLevels.length; i++) {
-    enabledOutputs[logLevels[i]] = true;
+  for (const logLevel of logLevels) {
+    enabledOutputs[logLevel] = true;
   }
 
   allOutputs = {
diff --git a/src/viewer/Earth.ts b/src/viewer/Earth.ts
index 851e9ac..0ba6c3f 100644
--- a/src/viewer/Earth.ts
+++ b/src/viewer/Earth.ts
@@ -2,6 +2,7 @@ import { ShaderMaterial, UniformsUtils, Texture } from 'three';
 import { Color, TextureLoader, MeshPhongMaterial, SphereGeometry, Mesh, Group, BackSide, AdditiveBlending } from '../utils/three';
 import SceneComponent from './interfaces/SceneComponent';
 import SatelliteOrbitScene from './SatelliteOrbitScene';
+import { ViewerContext } from './interfaces/ViewerContext';
 
 class Earth implements SceneComponent {
   baseUrl = '';
@@ -91,7 +92,7 @@ class Earth implements SceneComponent {
     group.add(mesh);
   }
 
-  async init (scene: SatelliteOrbitScene, context: Record<string, any>) {
+  async init (scene: SatelliteOrbitScene, context: ViewerContext) {
     if (context.config) {
       this.baseUrl = context.config.baseUrl;
     }
@@ -122,7 +123,9 @@ class Earth implements SceneComponent {
     this.group.add(this.sphere);
 
     if (this.addClouds) {
-      this.initClouds(scene, this.group);
+      this.initClouds(scene, this.group).catch(error => {
+        console.error('Error loading clouds', error);
+      });
     }
 
     if (this.addAtmosphere) {
diff --git a/src/viewer/Orbits.ts b/src/viewer/Orbits.ts
index fa1dd31..10812be 100644
--- a/src/viewer/Orbits.ts
+++ b/src/viewer/Orbits.ts
@@ -7,6 +7,7 @@ import SatelliteOrbitScene from './SatelliteOrbitScene';
 import logger from '../utils/logger';
 import SatelliteGroups from './SatelliteGroups';
 import SelectableSatellite from './interfaces/SelectableSatellite';
+import { ViewerContext } from './interfaces/ViewerContext';
 
 class Orbits implements SceneComponent, SelectableSatellite {
   config: Record<string, any> = {};
@@ -221,12 +222,12 @@ class Orbits implements SceneComponent, SelectableSatellite {
     // calculate tracks
     if (this.satelliteGroup) {
       const satellites = this.satelliteGroup.sats;
-      const satelliteIds = satellites.map((entry: Record<string, any>) => entry.satId as number);
+      const satelliteIds = satellites.map((entry) => entry.satId as number);
       this.calculateOrbits(satelliteIds);
     }
   }
 
-  init (scene: SatelliteOrbitScene, context: Record<string, any>) {
+  init (scene: SatelliteOrbitScene, context: ViewerContext) {
     this.config = context.config;
     this.scene = scene;
     this.orbitWorker = new OrbitCalculationWorker();
diff --git a/src/viewer/SatelliteGroups.ts b/src/viewer/SatelliteGroups.ts
index b8b9656..2a0c86c 100644
--- a/src/viewer/SatelliteGroups.ts
+++ b/src/viewer/SatelliteGroups.ts
@@ -1,6 +1,7 @@
 import SatGroup from './SatelliteGroup';
 import logger from '../utils/logger';
 import SatelliteStore from './SatelliteStore';
+import type SatelliteGroup from './SatelliteGroup';
 
 class SatelliteGroups {
   groups: Record<string, SatGroup> = {};
@@ -8,7 +9,7 @@ class SatelliteGroups {
   sats: any[] = [];
   satelliteStore: SatelliteStore;
 
-  constructor (satelliteGroups: Record<string, any>[], satelliteStore: SatelliteStore) {
+  constructor (satelliteGroups: SatelliteGroup[], satelliteStore: SatelliteStore) {
     if (!satelliteStore) {
       throw new Error('satelliteStore is required');
     }
@@ -26,13 +27,12 @@ class SatelliteGroups {
     this.selectedGroup = group;
     if (!group) {
       this.clearSelect();
-      return;
     }
   }
 
   forEach (callback: (satId: number) => void) {
-    for (let i = 0; i < this.sats.length; i++) {
-      callback(this.sats[i].satId);
+    for (const sat of this.sats) {
+      callback(sat.satId);
     }
   }
 
@@ -54,21 +54,21 @@ class SatelliteGroups {
 
   reloadGroups () {
     const keys = Object.keys(this.groups);
-    for (let i = 0; i < keys.length; i++) {
-      this.groups[keys[i]].reload();
+    for (const key of keys) {
+      this.groups[key].reload();
     }
   }
 
-  resetConfig (satelliteGroups: Record<string, any>[]) {
+  resetConfig (satelliteGroups: SatelliteGroup[]) {
     const groupConfigs = satelliteGroups;
-    for (let i = 0; i < groupConfigs.length; i++) {
-      logger.debug(`registering satellite group ${groupConfigs[i].name} (id: ${groupConfigs[i].id})`);
-      this.groups[groupConfigs[i].id.toLowerCase()] = new SatGroup(
-        groupConfigs[i].id.toLowerCase(),
-        groupConfigs[i].name,
-        groupConfigs[i].groupType,
-        groupConfigs[i].data,
-        this.satelliteStore as SatelliteStore
+    for (const groupConfig of groupConfigs) {
+      logger.debug(`registering satellite group ${groupConfig.name} (id: ${groupConfig.id})`);
+      this.groups[groupConfig.id.toLowerCase()] = new SatGroup(
+        groupConfig.id.toLowerCase(),
+        groupConfig.name,
+        groupConfig.groupType,
+        groupConfig.data,
+        this.satelliteStore
       );
     }
   }
diff --git a/src/viewer/SatelliteStore.ts b/src/viewer/SatelliteStore.ts
index 33663fc..ac623b9 100644
--- a/src/viewer/SatelliteStore.ts
+++ b/src/viewer/SatelliteStore.ts
@@ -11,7 +11,10 @@ class SatelliteStore {
   tleUrl = `${config.baseUrl}/data/attributed-TLE.json`;
   eventManager: EventManager;
   satData: SatelliteObject[] = [];
-  attribution?: Record<string, any>;
+  attribution?: {
+    name: string;
+    url: string;
+  };
   updateDate?: Date;
   satelliteVelocities: Float32Array = new Float32Array();
   satellitePositions: Float32Array = new Float32Array();
@@ -65,7 +68,10 @@ class SatelliteStore {
     }
   }
 
-  getAttribution (): Record<string, any> | undefined {
+  getAttribution (): {
+    name: string;
+    url: string;
+  } | undefined {
     return this.attribution;
   }
 
diff --git a/src/viewer/Satellites.ts b/src/viewer/Satellites.ts
index c6336b2..8366687 100644
--- a/src/viewer/Satellites.ts
+++ b/src/viewer/Satellites.ts
@@ -21,6 +21,8 @@ import DefaultColorScheme from './color-schemes/DefaultColorScheme';
 import SelectableSatellite from './interfaces/SelectableSatellite';
 import ShaderStore from './ShaderStore';
 import GroupColorScheme from './color-schemes/GroupColorScheme';
+import { SatelliteObject } from './interfaces/SatelliteObject';
+import { ViewerContext } from './interfaces/ViewerContext';
 
 class Satellites implements SceneComponent, SelectableSatellite {
   baseUrl = '';
@@ -94,7 +96,7 @@ class Satellites implements SceneComponent, SelectableSatellite {
   /**
    * update point colours
    */
-  private updateSatellitesMaterial (satCount: number, satellites: Record<string, any>[]) {
+  private updateSatellitesMaterial (satCount: number, satellites: SatelliteObject[]) {
     if (this.geometry?.attributes.color && this.currentColorScheme && this.satelliteStore) {
       // Adjust if the satellite count adjusts
       if (this.satelliteColors.length === 0 || (satCount * 4 !== this.satelliteColors.length)) {
@@ -332,7 +334,7 @@ class Satellites implements SceneComponent, SelectableSatellite {
     }));
   }
 
-  async init (scene: SatelliteOrbitScene, context: Record<string, any>) {
+  async init (scene: SatelliteOrbitScene, context: ViewerContext) {
     this.satelliteStore = context.satelliteStore;
     this.shaderStore = context.shaderStore;
     this.scene = scene;
diff --git a/src/viewer/Universe.ts b/src/viewer/Universe.ts
index 1cfe126..4c79d33 100644
--- a/src/viewer/Universe.ts
+++ b/src/viewer/Universe.ts
@@ -1,9 +1,10 @@
+import { ViewerContext } from './interfaces/ViewerContext';
 import { TextureLoader } from '../utils/three';
 import SceneComponent from './interfaces/SceneComponent';
 import SatelliteOrbitScene from './SatelliteOrbitScene';
 
 class Universe implements SceneComponent {
-  init (scene: SatelliteOrbitScene, context: Record<string, any>) {
+  init (scene: SatelliteOrbitScene, context: ViewerContext) {
     const baseUrl = context.config.baseUrl;
     const texture = new TextureLoader().load(`${baseUrl}textures/example_render.jpg`);
 
diff --git a/src/viewer/color-schemes/ColorScheme.ts b/src/viewer/color-schemes/ColorScheme.ts
index 671be38..0ffcb7f 100644
--- a/src/viewer/color-schemes/ColorScheme.ts
+++ b/src/viewer/color-schemes/ColorScheme.ts
@@ -1,15 +1,16 @@
 import SatelliteGroup from '../SatelliteGroup';
+import { SatelliteObject } from '../interfaces/SatelliteObject';
 
 class ColorScheme {
   name: string;
-  colorizer: (satellite: Record<string, any>, group?: SatelliteGroup) => { color: number[], pickable: boolean };
+  colorizer: (satellite: SatelliteObject, group?: SatelliteGroup) => { color: number[], pickable: boolean };
 
-  constructor (name: string, colorizer: (satellite: Record<string, any>) => { color: number[], pickable: boolean }) {
+  constructor (name: string, colorizer: (satellite: SatelliteObject) => { color: number[], pickable: boolean }) {
     this.name = name;
     this.colorizer = colorizer;
   }
 
-  getSatelliteColor (satellite: Record<string, any>, group?: SatelliteGroup): { color: number[], pickable: boolean } {
+  getSatelliteColor (satellite: SatelliteObject, group?: SatelliteGroup): { color: number[], pickable: boolean } {
     return this.colorizer(satellite, group);
   }
 }
diff --git a/src/viewer/color-schemes/DefaultColorScheme.ts b/src/viewer/color-schemes/DefaultColorScheme.ts
index 64c0e3d..97289cc 100644
--- a/src/viewer/color-schemes/DefaultColorScheme.ts
+++ b/src/viewer/color-schemes/DefaultColorScheme.ts
@@ -1,8 +1,9 @@
+import { SatelliteObject } from '../interfaces/SatelliteObject';
 import ColorScheme from './ColorScheme';
 
 class DefaultColorScheme extends ColorScheme {
   constructor () {
-    super ('Default color scheme', (satellite: Record<string, any>) => {
+    super ('Default color scheme', (satellite: SatelliteObject) => {
       let color = [1.0, 1.0, 0.0, 1.0];
       let pickable = false;
 
diff --git a/src/viewer/color-schemes/GroupColorScheme.ts b/src/viewer/color-schemes/GroupColorScheme.ts
index 3a46d5b..45585e7 100644
--- a/src/viewer/color-schemes/GroupColorScheme.ts
+++ b/src/viewer/color-schemes/GroupColorScheme.ts
@@ -1,11 +1,12 @@
 import SatelliteGroup from '@satellite-viewer/SatelliteGroup';
 import ColorScheme from './ColorScheme';
+import { SatelliteObject } from '../interfaces/SatelliteObject';
 
 class GroupColorScheme extends ColorScheme {
   constructor () {
-    super ('Group color scheme', (satellite: Record<string, any>, group?: SatelliteGroup) => {
+    super ('Group color scheme', (satellite: SatelliteObject, group?: SatelliteGroup) => {
       if (satellite) {
-        if (group && group.hasSat(satellite.id)) {
+        if (group?.hasSat(satellite.id)) {
           return {
             color: [1.0, 0.2, 0.0, 1.0],
             pickable: true
diff --git a/src/viewer/index.ts b/src/viewer/index.ts
index 71106e2..577a820 100644
--- a/src/viewer/index.ts
+++ b/src/viewer/index.ts
@@ -16,6 +16,8 @@ import SatelliteGroup from './SatelliteGroup';
 import ShaderStore from './ShaderStore';
 import logger from '@/utils/logger';
 import { ArrowHelper, Raycaster, Vector2, Vector3 } from 'three';
+import { SatelliteObject } from './interfaces/SatelliteObject';
+import { ViewerContext } from './interfaces/ViewerContext';
 
 class Viewer {
   config: Record<string, any> = {
@@ -28,7 +30,12 @@ class Viewer {
   camera?: PerspectiveCamera;
   controls?: OrbitControls;
   renderer?: WebGLRenderer;
-  context: Record<string, any> = {};
+  context: ViewerContext = {
+    satelliteGroups: null as unknown as SatelliteGroups,
+    config: null as unknown as Record<string, any>,
+    satelliteStore: null as unknown as SatelliteStore,
+    shaderStore: null as unknown as ShaderStore
+  };
   satelliteGroups?: SatelliteGroups;
   satelliteStore?: SatelliteStore;
   shaderStore?: ShaderStore;
@@ -82,7 +89,7 @@ class Viewer {
     }
   }
 
-  private onSatDataLoaded (satData: Record<string, any>) {
+  private onSatDataLoaded (satData: SatelliteObject[]) {
     this.eventManager.fireEvent('satdataloaded', satData);
     this.ready = true;
   }
@@ -404,7 +411,7 @@ class Viewer {
     this.satellites?.setSatelliteGroup(satelliteGroup);
   }
 
-  getSelectedSatellite (): Record<string, any> | undefined {
+  getSelectedSatellite (): SatelliteObject | undefined {
     if (this.satelliteStore) {
       return this.satelliteStore.getSatellite(this.selectedSatelliteIdx);
     }
diff --git a/src/viewer/interfaces/SceneComponent.ts b/src/viewer/interfaces/SceneComponent.ts
index 399ae68..465b1bc 100644
--- a/src/viewer/interfaces/SceneComponent.ts
+++ b/src/viewer/interfaces/SceneComponent.ts
@@ -1,7 +1,8 @@
+import { ViewerContext } from './ViewerContext';
 import SatelliteOrbitScene from '../SatelliteOrbitScene';
 
 interface SceneComponent {
-  init (scene: SatelliteOrbitScene, context: Record<string, any>): void | Promise<void>;
+  init (scene: SatelliteOrbitScene, context: ViewerContext): void | Promise<void>;
   update (scene?: SatelliteOrbitScene): void;
 }
 
diff --git a/src/viewer/interfaces/ViewerContext.ts b/src/viewer/interfaces/ViewerContext.ts
new file mode 100644
index 0000000..ea3c3d1
--- /dev/null
+++ b/src/viewer/interfaces/ViewerContext.ts
@@ -0,0 +1,11 @@
+import type SatelliteGroups from '../SatelliteGroups';
+import type SatelliteStore from '../SatelliteStore';
+import type ShaderStore from '../ShaderStore';
+
+
+export interface ViewerContext {
+  satelliteGroups: SatelliteGroups;
+  config: Record<string, any>;
+  satelliteStore: SatelliteStore;
+  shaderStore: ShaderStore;
+}