diff --git a/src/lib/mathUtils.js b/src/lib/mathUtils.js
index 6eb5391..26e3592 100644
--- a/src/lib/mathUtils.js
+++ b/src/lib/mathUtils.js
@@ -14,7 +14,7 @@ export function toDirection(orientation) {
 		direction += 360;
 	}
 
-	return direction;
+	return direction === 0 ? 0 : direction;
 }
 
 /**
diff --git a/src/tests/lib/formatters.test.js b/src/tests/lib/formatters.test.js
index 1b3f39f..0e51b90 100644
--- a/src/tests/lib/formatters.test.js
+++ b/src/tests/lib/formatters.test.js
@@ -1,5 +1,5 @@
-import { describe, it, expect } from 'vitest';
-import { convertUnixToTime } from '$lib/formatters';
+import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
+import { convertUnixToTime, formatLastUpdated, formatTime } from '$lib/formatters';
 
 describe('convertUnixToTime', () => {
 	it('returns a blank string when its input is null', () => {
@@ -14,3 +14,108 @@ describe('convertUnixToTime', () => {
 		expect(convertUnixToTime(1727442050)).toBe('01:00 PM');
 	});
 });
+
+describe('formatLastUpdated', () => {
+	const translations = {
+		min: 'min',
+		sec: 'sec',
+		ago: 'ago'
+	};
+
+	beforeEach(() => {
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date('2024-01-16T12:00:00Z'));
+	});
+
+	afterEach(() => {
+		vi.useRealTimers();
+	});
+
+	it('formats time less than a minute ago', () => {
+		const timestamp = new Date('2024-01-16T11:59:30Z');
+		const result = formatLastUpdated(timestamp, translations);
+		expect(result).toBe('30 sec ago');
+	});
+
+	it('formats time more than a minute ago', () => {
+		const timestamp = new Date('2024-01-16T11:58:30Z');
+		const result = formatLastUpdated(timestamp, translations);
+		expect(result).toBe('1 min 30 sec ago');
+	});
+
+	it('formats time multiple minutes ago', () => {
+		const timestamp = new Date('2024-01-16T11:57:15Z');
+		const result = formatLastUpdated(timestamp, translations);
+		expect(result).toBe('2 min 45 sec ago');
+	});
+
+	it('handles just-now timestamps', () => {
+		const timestamp = new Date('2024-01-16T11:59:59Z');
+		const result = formatLastUpdated(timestamp, translations);
+		expect(result).toBe('1 sec ago');
+	});
+
+	it('works with different translation objects', () => {
+		const spanishTranslations = {
+			min: 'min',
+			sec: 'seg',
+			ago: 'atrás'
+		};
+		const timestamp = new Date('2024-01-16T11:58:30Z');
+		const result = formatLastUpdated(timestamp, spanishTranslations);
+		expect(result).toBe('1 min 30 seg atrás');
+	});
+
+	it('handles zero seconds case', () => {
+		const timestamp = new Date('2024-01-16T12:00:00Z');
+		const result = formatLastUpdated(timestamp, translations);
+		expect(result).toBe('0 sec ago');
+	});
+});
+
+describe('formatTime', () => {
+	beforeEach(() => {
+		// Set timezone to UTC to avoid local timezone issues
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date('2024-01-16T12:00:00Z'));
+		// Mock toLocaleTimeString to ensure consistent output
+		vi.spyOn(Date.prototype, 'toLocaleTimeString').mockImplementation(function () {
+			const hours = this.getUTCHours();
+			const minutes = this.getUTCMinutes();
+			const ampm = hours >= 12 ? 'PM' : 'AM';
+			const hour12 = hours % 12 || 12;
+			const minutesPadded = minutes.toString().padStart(2, '0');
+			return `${hour12}:${minutesPadded} ${ampm}`;
+		});
+	});
+
+	afterEach(() => {
+		vi.useRealTimers();
+		vi.restoreAllMocks();
+	});
+
+	it('handles morning times', () => {
+		const result = formatTime('2024-01-16T09:15:00Z');
+		expect(result).toBe('9:15 AM');
+	});
+
+	it('handles afternoon times', () => {
+		const result = formatTime('2024-01-16T14:45:00Z');
+		expect(result).toBe('2:45 PM');
+	});
+
+	it('handles midnight', () => {
+		const result = formatTime('2024-01-16T00:00:00Z');
+		expect(result).toBe('12:00 AM');
+	});
+
+	it('handles noon', () => {
+		const result = formatTime('2024-01-16T12:00:00Z');
+		expect(result).toBe('12:00 PM');
+	});
+
+	it('pads minutes with leading zeros', () => {
+		const result = formatTime('2024-01-16T09:05:00Z');
+		expect(result).toBe('9:05 AM');
+	});
+});
diff --git a/src/tests/lib/keybinding.test.js b/src/tests/lib/keybinding.test.js
new file mode 100644
index 0000000..618bae7
--- /dev/null
+++ b/src/tests/lib/keybinding.test.js
@@ -0,0 +1,158 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { keybinding } from '$lib/keybinding';
+
+describe('keybinding action', () => {
+	let node;
+	let mockWindow;
+	let currentHandler;
+
+	beforeEach(() => {
+		node = {
+			click: vi.fn()
+		};
+
+		mockWindow = {
+			addEventListener: vi.fn((event, handler) => {
+				if (event === 'keydown') {
+					currentHandler = handler;
+				}
+			}),
+			removeEventListener: vi.fn((event, handler) => {
+				if (event === 'keydown' && handler === currentHandler) {
+					currentHandler = null;
+				}
+			})
+		};
+
+		// Set up mock window
+		const originalWindow = global.window;
+		global.window = mockWindow;
+
+		beforeEach.cleanup = () => {
+			global.window = originalWindow;
+		};
+	});
+
+	afterEach(() => {
+		beforeEach.cleanup?.();
+		vi.clearAllMocks();
+		currentHandler = null;
+	});
+
+	const triggerKeydown = (keyParams) => {
+		const event = {
+			code: keyParams.code || '',
+			altKey: keyParams.alt || false,
+			shiftKey: keyParams.shift || false,
+			ctrlKey: keyParams.control || false,
+			metaKey: keyParams.control || false,
+			preventDefault: vi.fn()
+		};
+
+		if (currentHandler) {
+			currentHandler(event);
+		}
+		return event;
+	};
+
+	it('adds keydown event listener on initialization', () => {
+		keybinding(node, { code: 'KeyA' });
+		expect(mockWindow.addEventListener).toHaveBeenCalledWith('keydown', expect.any(Function));
+	});
+
+	it('removes existing listener before adding new one on update', () => {
+		let params = { code: 'KeyA' };
+		const action = keybinding(node, params);
+
+		// Clear the initial setup calls
+		mockWindow.addEventListener.mockClear();
+		mockWindow.removeEventListener.mockClear();
+
+		// Update the params object directly
+		params.code = 'KeyB';
+		action.update();
+
+		expect(mockWindow.removeEventListener).toHaveBeenCalledTimes(1);
+		expect(mockWindow.addEventListener).toHaveBeenCalledTimes(1);
+	});
+
+	it('removes listener on destroy', () => {
+		const action = keybinding(node, { code: 'KeyA' });
+		action.destroy();
+
+		expect(mockWindow.removeEventListener).toHaveBeenCalled();
+	});
+
+	it('only responds to matching key code', () => {
+		keybinding(node, { code: 'KeyA' });
+
+		triggerKeydown({ code: 'KeyB' });
+		expect(node.click).not.toHaveBeenCalled();
+
+		triggerKeydown({ code: 'KeyA' });
+		expect(node.click).toHaveBeenCalledTimes(1);
+	});
+
+	it('responds to updated key code', () => {
+		// Create params object that we'll modify
+		let params = { code: 'KeyA' };
+		const action = keybinding(node, params);
+
+		// Verify initial binding works
+		triggerKeydown({ code: 'KeyA' });
+		expect(node.click).toHaveBeenCalledTimes(1);
+
+		// Update params and trigger update
+		node.click.mockClear();
+		params.code = 'KeyB';
+		action.update();
+
+		// Verify new binding works
+		triggerKeydown({ code: 'KeyB' });
+		expect(node.click).toHaveBeenCalledTimes(1);
+
+		// Verify old binding doesn't work
+		node.click.mockClear();
+		triggerKeydown({ code: 'KeyA' });
+		expect(node.click).not.toHaveBeenCalled();
+	});
+
+	it('handles modifier keys correctly', () => {
+		keybinding(node, {
+			code: 'KeyA',
+			alt: true,
+			shift: true,
+			control: true
+		});
+
+		triggerKeydown({ code: 'KeyA' });
+		expect(node.click).not.toHaveBeenCalled();
+
+		triggerKeydown({ code: 'KeyA', alt: true });
+		expect(node.click).not.toHaveBeenCalled();
+
+		triggerKeydown({ code: 'KeyA', alt: true, shift: true, control: true });
+		expect(node.click).toHaveBeenCalledTimes(1);
+	});
+
+	it('handles meta key as control', () => {
+		keybinding(node, {
+			code: 'KeyA',
+			control: true
+		});
+
+		const event = triggerKeydown({ code: 'KeyA', control: true });
+		expect(node.click).toHaveBeenCalledTimes(1);
+		expect(event.preventDefault).toHaveBeenCalled();
+	});
+
+	it('triggers callback instead of click when provided', () => {
+		const callback = vi.fn();
+		keybinding(node, { code: 'KeyA', callback });
+
+		triggerKeydown({ code: 'KeyA' });
+
+		expect(callback).toHaveBeenCalledTimes(1);
+		expect(node.click).not.toHaveBeenCalled();
+	});
+});
diff --git a/src/tests/lib/mathUtils.test.js b/src/tests/lib/mathUtils.test.js
new file mode 100644
index 0000000..f8f4c43
--- /dev/null
+++ b/src/tests/lib/mathUtils.test.js
@@ -0,0 +1,99 @@
+import { describe, it, expect } from 'vitest';
+import { toDirection, calculateMidpoint } from '$lib/mathUtils';
+
+describe('toDirection', () => {
+	it('converts east orientation (0°) to 90° direction', () => {
+		expect(toDirection(0)).toBe(90);
+	});
+
+	it('converts north orientation (90°) to 0° direction', () => {
+		expect(toDirection(90)).toBe(0);
+	});
+
+	it('converts west orientation (180°) to 270° direction', () => {
+		expect(toDirection(180)).toBe(270);
+	});
+
+	it('converts south orientation (270°) to 180° direction', () => {
+		expect(toDirection(270)).toBe(180);
+	});
+
+	it('handles negative orientations', () => {
+		expect(toDirection(-90)).toBe(180); // -90° orientation should be 180° direction
+		expect(toDirection(-180)).toBe(270); // -180° orientation should be 270° direction
+		expect(toDirection(-270)).toBe(0); // -270° orientation should be 0° direction
+	});
+
+	it('handles orientations > 360°', () => {
+		expect(toDirection(450)).toBe(0); // 450° orientation (90° + 360°) should be 0° direction
+		expect(toDirection(720)).toBe(90); // 720° orientation (0° + 2*360°) should be 90° direction
+	});
+
+	it('converts arbitrary angles correctly', () => {
+		expect(toDirection(45)).toBe(45); // 45° orientation to 45° direction
+		expect(toDirection(135)).toBe(315); // 135° orientation to 315° direction
+		expect(toDirection(225)).toBe(225); // 225° orientation to 225° direction
+		expect(toDirection(315)).toBe(135); // 315° orientation to 135° direction
+	});
+});
+
+describe('calculateMidpoint', () => {
+	it('calculates midpoint for two stops', () => {
+		const stops = [
+			{ lat: 47.6062, lon: -122.3321 },
+			{ lat: 47.6092, lon: -122.3331 }
+		];
+
+		const result = calculateMidpoint(stops);
+
+		expect(result.lat).toBeCloseTo(47.6077);
+		expect(result.lng).toBeCloseTo(-122.3326);
+	});
+
+	it('calculates midpoint for multiple stops', () => {
+		const stops = [
+			{ lat: 47.6062, lon: -122.3321 },
+			{ lat: 47.6092, lon: -122.3331 },
+			{ lat: 47.6082, lon: -122.3341 }
+		];
+
+		const result = calculateMidpoint(stops);
+
+		expect(result.lat).toBeCloseTo(47.6079);
+		expect(result.lng).toBeCloseTo(-122.3331);
+	});
+
+	it('returns same point for single stop', () => {
+		const stops = [{ lat: 47.6062, lon: -122.3321 }];
+
+		const result = calculateMidpoint(stops);
+
+		expect(result.lat).toBe(47.6062);
+		expect(result.lng).toBe(-122.3321);
+	});
+
+	it('handles positive and negative coordinates', () => {
+		const stops = [
+			{ lat: -33.8688, lon: 151.2093 }, // Sydney
+			{ lat: 40.7128, lon: -74.006 } // New York
+		];
+
+		const result = calculateMidpoint(stops);
+
+		expect(result.lat).toBeCloseTo(3.422);
+		expect(result.lng).toBeCloseTo(38.6017);
+	});
+
+	it('handles coordinates around the same area', () => {
+		const stops = [
+			{ lat: 47.6062, lon: -122.3321 },
+			{ lat: 47.6065, lon: -122.3324 },
+			{ lat: 47.6068, lon: -122.3327 }
+		];
+
+		const result = calculateMidpoint(stops);
+
+		expect(result.lat).toBeCloseTo(47.6065);
+		expect(result.lng).toBeCloseTo(-122.3324);
+	});
+});