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SOS

Crash Detection & Anti-Theft Alarm for DMD Devices

The SOS app provides automatic crash detection and anti-theft alarm protection for your DMD Navigation device. It uses the built-in accelerometer, gyroscope, and GPS to detect crashes and unauthorized movement, sending emergency SMS alerts with your GPS location to your emergency contacts.

Quick Info
Access
Via Manage App
Requires
Android 12+ (API 31)
Type
System App (pre-installed)
Compatible Devices
DMD T665, T865X, T880X, Norte
Table of Contents

Overview

The SOS app runs as a background service that monitors your device's sensors while you ride. It has two independent protection features:

Crash Detection (SOS)

Detects crashes using the accelerometer, gyroscope, and GPS. When a crash is detected, a 60-second countdown starts. If not cancelled, emergency SMS messages with your GPS location are automatically sent to your emergency contacts.

Anti-Theft Alarm

Monitors the device for unauthorized movement when the screen is off and the device is docked. If movement is detected, a loud alarm sounds and SMS alerts are sent to your designated contact.

DMD2 Riding Group Integration: If you are using DMD2 with an active Riding Group and sharing your location, the SOS app will automatically set your status to "Help Me" when a crash is detected — alerting all group members on their map in real time.
Important: The SOS app is a safety aid, not a replacement for proper safety equipment or emergency services. Always wear appropriate protective gear and dial your local emergency number (112, 911, etc.) if you are able to.

Crash Detection (SOS)

The crash detection system uses multiple sensors to reliably detect when you've had an accident while minimizing false alarms.

Enable SOS

The master toggle that activates the crash detection system. When enabled, a background service starts monitoring your device's sensors whenever the device is docked and the screen is on.

Default: Disabled. You must enable this and configure your emergency contacts before it will work.
Crash Detection Conditions

For crash detection to be active, all of the following conditions must be met:

  • SOS is enabled in settings
  • The device is docked in its holder or connected via M9 cable
  • The screen is on
  • The sensor has been calibrated
  • Motion has been detected (you are moving)
  • You have traveled at least 15 meters (motorcycle) or 50 meters (car) from the starting point

When all these conditions are met, the status shows as ENGAGED.

Anti-Theft Alarm

The alarm feature monitors for unauthorized movement when the device is parked. It works independently from the crash detection system.

Enable Alarm

When enabled, the device monitors for movement while:

  • The device is docked in the holder or connected via M9 cable
  • The screen is off

If movement is detected (someone picks up or moves your motorcycle), the alarm triggers immediately with a loud sound and sends SMS alerts to your alarm contact.

Alarm Sound

When triggered, a loud continuous alarm plays on the device speakers. This can be toggled on or off in settings via the "Play Alarm Sound" option.

Alarm SMS

An SMS is sent to your alarm contact with the last known GPS location. Repeated messages are sent every 60 seconds while the alarm remains active.

Not available on T665 — The DMD T665 does not have the required motion sensors for parked vehicle detection. Alarm is available on T865X, T880X, and Norte.

Detection Modes

The app supports two detection modes, each tuned for different vehicle types. Select the correct mode for your vehicle in the settings.

Motorcycle Mode

Optimized for motorcycles, scooters, and similar two-wheeled vehicles.

  • Tilt detection: Detects when the bike falls to its side
  • Slow tip-over: Detects gradual falls (mud, sand, gravel)
  • Distance threshold: 15 meters
  • Confirmation time: 5 seconds
Car Mode

Tuned for cars and four-wheeled vehicles. More conservative to reduce false alarms from rough roads.

  • No tilt detection: Cars stay upright in most crashes
  • Post-impact calm check: Sensors must stabilize for 3 seconds
  • Distance threshold: 50 meters
  • Confirmation time: 8 seconds (longer cancel window)

Calibration

Before the SOS system can detect crashes, you must calibrate the sensor. Calibration tells the app what "normal" looks like for your specific mounting position.

How to Calibrate
  1. Mount the device in the exact position you will use while riding — in its holder or dock, on the vehicle
  2. Park the vehicle on a flat, level surface — avoid slopes, kickstands that tilt the bike, or uneven ground
  3. Make sure the vehicle and device are completely stationary
  4. Open the SOS app and expand the Status section
  5. Tap the CALIBRATE button
  6. The "Calibrated" indicator should change to a green checkmark
Calibration must be done with the device mounted in the position it will be used while riding. If you calibrate while holding the device in your hand or on a table, the crash detection will not work correctly and may produce false alarms.
Calibration is saved and persists across restarts. You only need to recalibrate if you change the mounting angle or position of the device.
The status card will pulse red when the device is not calibrated. The SOS system will not engage until calibration is completed.

Emergency Contacts & Messages

Configure the phone numbers and messages that will be sent when an emergency is detected.

Crash Detection (SOS) Contacts
Fall Phone Number 1
Primary emergency contact. Receives SMS when a crash is detected.
Fall Phone Number 2
Secondary emergency contact (optional). Also receives SMS.
Fall Message
The message sent with the SMS. Default: "Help! I had a crash at the following location:"
Your GPS location is automatically appended as a Google Maps link.
Send Fall Detection SMS
Toggle to enable/disable SMS sending. When disabled, the alarm sound still plays but no SMS is sent.
Anti-Theft Alarm Contact
Alarm Phone Number
Contact that receives SMS when movement is detected while parked.
Alarm Message
Default: "Alarm! Motorcycle Moved! Last Location:"
GPS location appended automatically.
Send Alarm SMS
Toggle to enable/disable alarm SMS.
Play Alarm Sound
Toggle the loud alarm sound on/off. Default: On.

How It Works

Here's what happens when a crash is detected:

1
Crash detected

The sensors detect a significant impact, combined with tilt, rotation, and/or sudden speed drop. The system waits 5-8 seconds to confirm.

2
Alert dialog appears

A full-screen overlay shows "Fall Detected!" with a 60-second countdown. A loud alarm starts playing.

3
You can cancel

If you're OK, press "Cancel" to stop the countdown and dismiss the alert. No SMS is sent.

4
SOS actions execute

If you press "Send Now" or the countdown reaches zero, emergency SMS messages are sent to your contacts with your GPS location as a Google Maps link. Additionally, if you are using DMD2 with an active Riding Group and sharing your location, your status will automatically be set to "Help Me" — alerting all group members of the emergency on their map.

5
"I'm OK" button

After the SOS is sent, an "I'm OK" button appears. Press it to stop the alarm sound. A 2-minute cooldown prevents duplicate alerts from the same event.

Status Indicators

The Status section in the app shows real-time information about the system state. Expand the Status accordion to view it.

Indicator Description
Connected Device is docked in the holder. ✓ = docked, ✗ = not docked
Calibrated Sensor baseline has been set. ✓ = calibrated, ✗ = needs calibration
Motion Detected The device detects acceleration variance (you are moving). ✓ = moving
Moved 15m / 50m You have traveled the minimum distance threshold (15m for motorcycle, 50m for car)
Overall ENGAGED = all conditions met, crash detection is active
NOT ENGAGED = one or more conditions not met

Manual SOS & Manual Alarm

The app provides manual trigger buttons for testing or emergency use:

Manual SOS Send

Found in the Settings accordion. Immediately triggers the crash detection flow with the 60-second countdown dialog. The system must be engaged for this to work.

Manual Alarm Send

Triggers the alarm immediately, playing the alarm sound and sending the alarm SMS to your designated contact. Useful for testing your alarm setup.

Background Service

While SOS or Alarm is enabled, you'll see a persistent notification:

ADV SOS

Monitoring sensors

This notification is required by Android for background services. It has minimal visual priority and no sound. The service also starts automatically at device boot if SOS or Alarm was previously enabled.

Troubleshooting

Check each status indicator:

  • Connected: Make sure the device is properly docked in the holder or connected via M9 cable.
  • Calibrated: Press the CALIBRATE button while the device is stationary and docked.
  • Motion Detected: You need to actually be moving — the app detects acceleration changes.
  • Moved 15m/50m: You need to travel at least 15m (motorcycle) or 50m (car) from where you started.
  • Screen: The screen must be ON for crash detection. Screen off disables fall detection.

  • Press "Cancel" on the alert dialog to stop the SMS from being sent.
  • If you ride on very rough terrain, consider switching to Car mode which has higher thresholds and a longer confirmation time.
  • Make sure you have calibrated the sensor correctly with the device stationary on level ground.
  • The system has a 2-minute cooldown after each event to prevent duplicate alerts.

  • Make sure "Send Fall Detection SMS" (or "Send Alarm SMS") is toggled on.
  • Verify that valid phone numbers are entered (including country code).
  • Check that the device has an active SIM card with SMS capability.
  • Ensure the SMS permission has been granted to the app.

The alarm only triggers when the screen is OFF and the device is docked or M9 connected. It activates 3 seconds after the screen turns off to avoid false triggers. If the alarm is too sensitive for your parking situation (e.g., windy location), you can disable it via the "Enable Alarm" toggle or turn off the sound with "Play Alarm Sound".

The anti-theft alarm feature is not available on the DMD T665 because it lacks the motion sensors needed for parked vehicle detection. This feature is available on T865X, T880X, and Norte.

The SMS includes your custom message followed by a Google Maps link to your GPS location. For example:

Help! I had a crash at the following location:
https://maps.google.com/?q=41.1933,-8.2999

Your emergency contact can tap the link to see your exact location on Google Maps.

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