<!-- APRS MODE -->
                <div id="aprsMode" class="mode-content">
                    <div class="section">
                        <h3>APRS Tracking</h3>
                        <p style="color: var(--text-secondary); font-size: 11px; line-height: 1.5; margin-bottom: 15px;">
                            Decode APRS (Automatic Packet Reporting System) amateur radio position reports on VHF.
                        </p>
                        <div style="background: rgba(255,193,7,0.1); border: 1px solid var(--accent-yellow); border-radius: 4px; padding: 8px; margin-bottom: 10px; font-size: 10px;">
                            <strong style="color: var(--accent-yellow);">Amateur Radio</strong><br>
                            <span style="color: var(--text-secondary);">APRS operates on 144.390 MHz (N. America) or 144.800 MHz (Europe). Decodes position, weather, and messages from ham radio operators.</span>
                        </div>
                        <div style="background: rgba(74, 158, 255, 0.1); border: 1px solid rgba(74, 158, 255, 0.3); border-radius: 4px; padding: 8px; font-size: 10px;">
                            <span style="color: var(--accent-cyan);">Controls in function bar above map</span>
                        </div>
                    </div>
                </div>
