Introduction

The Indian Space Research Organisation (ISRO) has pioneered an innovative Distress Alert Transmitter (DAT) to enhance the safety of fishermen at sea.
This second-generation DAT, known as DAT-SG, offers advanced capabilities and features, revolutionizing how emergency messages are communicated from fishing boats.

About Distress Alert Transmitter (DAT-SG)

Operational Since 2010: The initial version of DAT became operational in 2010, enabling fishermen to send emergency messages through a communication satellite.
Central Control Station: Messages were received at the Indian Mission Control Centre (INMCC), a central control station, where alert signals were decoded to identify the distressed fishing boat.
Coordination with MRCCs: The extracted information was then forwarded to Maritime Rescue Coordination Centres (MRCCs) under the Indian Coast Guard (ICG), facilitating coordinated search and rescue operations.
Widespread Use: Over 20,000 DATs were deployed and utilized for distress communication.

Technological Advancements: ISRO leveraged advancements in satellite communication and navigation to create the second-generation DAT (DAT-SG).
Acknowledgement Feature: DAT-SG now includes an acknowledgement feature, providing assurance to fishermen that their distress alert has been received and that help is on the way.
Two-Way Communication: In addition to sending distress signals, DAT-SG can receive messages from control centers. This allows the transmission of advance alerts regarding adverse weather conditions, cyclones, tsunamis, or other emergencies, enabling fishermen to make informed decisions for their safety.
Enhanced Fishing Zone Information: DAT-SG also disseminates information about potential fishing zones to fishermen at regular intervals, optimizing their catch and conserving time and fuel.
Mobile Connectivity: DAT-SG can be connected to mobile phones via Bluetooth, and messages can be displayed in the fishermen’s native language using a dedicated mobile app.

Sagarmitra Network: The central control station, INMCC, employs a web-based network management system called Sagarmitra. This system maintains a database of registered DAT-SGs and facilitates real-time access for MRCCs.
Real-time Coordination: Sagarmitra enables Indian Coast Guard personnel to swiftly respond to distress calls without delay, enhancing search and rescue operations.
Operational 24/7: DAT-SG services are available round-the-clock, ensuring continuous support to fishermen facing emergencies at sea.

Nabhmitra: Satellite-Based Safety Device for Fishermen