marine navigation equipment marine service sound — Seanav India provides certified marine navigation and communication support for vessels worldwide.

SOUND POWERED TELEPHONE 4L12A — certified marine service

The Sound Powered Telephone 4L12A is an essential communication device widely used in maritime environments, particularly for critical onboard communication during emergency situations and standard operations. Unlike conventional telecommunication systems, the 4L12A operates without external power, relying purely on the energy generated by the user's voice. This makes it an incredibly reliable option for ships, offshore platforms, and other maritime settings where power reliability is a concern. Designed with durability in mind, the 4L12A is built to withstand harsh marine conditions, including high humidity, saltwater exposure, and temperature variations. Its rugged construction ensures long-term performance and reliability, making it a preferred choice for both military and commercial vessels. The 4L12A system is typically installed in critical areas such as engine rooms, navigation…

Why choose Seanav India

Certified marine electronics engineers with gyro, radar, GMDSS, and bridge system expertise
IMO, SOLAS, and class-society aligned installation, testing, and documentation
24/7 emergency breakdown support at 170+ Indian ports and worldwide coverage from Dubai

Service scope for marine navigation equipment

Seanav India supplies, installs, calibrates, and certifies marine navigation equipment systems for fleets calling your port. We provide OEM parts, emergency breakdown cover, and class-society aligned test records.

Maritime expertise: Seanav India is a Dubai-headquartered NAVCOM specialist trusted by fleet operators for navigation and communication systems. Request support from our certified engineers: Contact Seanav India · Navigation services · Marine equipment.

GMDSS & Radio Survey resources

4L12A Achara Achara port Agardanda Shipyard Agatti Agatti port Alappuzha Alappuzha port Alibag Alibag port Amini Amini port Andhra Pradesh port Andrott Andrott port Angre Port APM Terminal Arnala Arnala port Azhikkal Azhikkal port Balasore Balasore port Bandra Bandra port Bankot Bankot port Bassein Bassein port Bedi Bedi port Behrabalpur Behrabalpur port Belekeri Belekeri port Betul Betul port Beypore Beyt Beyt port Bhagwa Bhagwa port Bharuch Bharuch port Bhatkal Bhatkal port Bhavanapadu Bhavanapadu port Bhavnagar Bhavnagar port Bheemunipatnam Bheemunipatnam port Bhiwandi Bhiwandi port Billimora Billimora port Bitra Bitra port Bombat Port Trust Bombay Port Borli port Borli-Mandla Borya Borya port BPT port Calingapatnam Calingapatnam port Campbell Bay Campbell Bay port Car Nicobar Car Nicobar port Castle Bay Castle Bay port Changi Naval Base Chapora Chapora port Chennai Chennai Port Chetlat Chetlat port Chhara LNG Terminal Chowra Chowra port Cinque Island Cinque Island port Cochin Cochin Port Colachel Colachel port Cuddalore Cuddalore port Dabhol Dabhol port Dahanu Dahanu port Dahej Dahej Port Daman Daman port Datiware Datiware port Deendayal Port Trust Deogad Deogad port Dhamra Port Dharamtar Dharamtar Port Dighi Dighi Port Diglipur Diglipur port Diu Diu port Dugong Creek Dugong Creek port East Island East Island port Ennore Ennore Port Faraka Faraka port Gangavaram Gangavaram port Ghogha Ghogha port Gopalpur Gopalpur Port GPPL GPPL port Gujarat port Haldia Haldia Port Hangarkatta Hangarkatta port Harnai Harnai port Havelock Havelock port Hazira Port Honavar Honavar port Hut Bay Hut Bay port India Jafarabad Jafarabad port Jafrabad Terminal Jaigad Jaigad Port Jaigad Terminal Jaitapur Jaitapur port Jakhau Jakhau port Jamnagar port Jawaharlal Nehru Jawaharlal Nehru port Jawaharlal Nehru Port Trust port JNPT port Jodia Jodia port Jolly Buoy Island Jolly Buoy Island port JSW Jaigad Port JSW Salav Port Jurong Port Kadmat Kadmat port Kakinada Kakinada Port Kalpeni Kalpeni port Kalyan Kalyan port Kamarajar Port Kandla Kandla Port Kannur Kannur port Kanyakumari Kanyakumari port Karaikal Port Karanja Karanja Port Karnataka port Karwar Karwar port Kasargode Kasargode port Katchal Katchal port Kattupalli Kattupalli Port Kavaratti Kavaratti port Kellwa-Mahim Kellwa-Mahim port Kelshi Kelshi port Kelvin Hughes Kerala port Khambhat Khambhat port Kiltan Kiltan port Kiranpani Kiranpani port Kochi LNG Terminal Kodungallore Kodungallore port Kolak Kolak port Kolkata Kolkata Port Kondul Kondul port Konkan Terminal Kotda Kotda port Koteshwar Koteshwar port Kozhikode Kozhikode/Beypore port Krishnapatnam Krishnapatnam Port Kudankulam Kudankulam port Kukrahati LNG Terminal Kulpi Kulpi port Kumbharu Kumbharu port Kundapur Kundapur port Machilipatnam Machilipatnam Port Machillipatnam port Madhwad Madhwad port Magdalla Magdalla port magnetron Maharashtra port Mahuva Mahuva port Malpe Malpe port Malvan Malvan port Manappad Manappad port Mandad Mandad port Mandla port Mandvi Mandvi port Mandwa Mandwa port Mangalore Mangalore Port Mangrol Mangrol port Manori Manori port MANTA 2300 Marine Tracking Marmugao Marmugao port Maroli Maroli port Mayabunder Mayabunder port MBPT MG5223 Minicoy Minicoy port MK7 More More port Mormugao Port Mul-dwarka Mul-dwarka port Mulapeta Port Mumbai Mumbai Port Mundra Mundra Port Murud-Janjira Murud-Janjira port Mus Mus port Mutyalammapalem Mutyalammapalem port Nagapattanam port Nagapattinam Nagapattinam port Nancowry Nancowry port Nandgaon Nandgaon port Narsapur Narsapur port Navabandar Navabandar port Navlakhi Navlakhi port Nawapur Nawapur port Neendakara Neendakara port Neil Neil port New Bedi Port New Mangalore New Mangalore Port Nhava Sheva port Niwti Niwti port Nizampatnam Nizampatnam port Odisha port Okha Okha port Onjal Onjal port Padubidri Padubidri port Palshet Palshet port Pamban Pamban port Panaji Panaji port Panvel Panvel port Paradip Paradip Port Pasir Panjang Terminal Pilllow Millow Pilllow Millow port Pindhara Pindhara port Pipavav Pipavav port Pir Pau Pondicherry Pondicherry port Ponnani Ponnani port Porbandar Porbandar port Port Blair Port Blair port Port of Singapore Powered Punnakayal Punnakayal port Purnagad Purnagad port PY-3 PY-3 Oil Field port Quilon Quilon port Radar Rajpara Rajpara port Rajpuri Rajpuri port Ramayapatnam Port Rameswaram Rameswaram port Rangat Rangat port Ratnagiri Ratnagiri port Ravva Ravva port Redi Redi port Revdanda Revdanda Port Rewas Rewas port Rohini Yard port Rupen Rupen port S-band Salaya Salaya port Satpati Satpati port Sembawang Port Shriwardhan Shriwardhan port Sikka Sikka Port Singapore Sound South Bay South Bay port Surat port Syama Prasad Mookerjee Port Tadri Tadri port Talaja Talaja port Talpona Talpona port Tamil Nadu port Tanjong Pagar Terminal Tarapur Tarapur port Telephone Teressa Teressa port Thal Thal port Thalassery Thalassery port Thiruchopuram Thiruchopuram port Thirukkadaiyur Thirukkadaiyur port Thiruvananthapuram Thiruvananthapuram port Tillonchong Tillonchong port Tiracol Tiracol port Tiwri-Varoda Tiwri-Varoda port Trombay Trombay port Tuna Port Tuticorin Tuticorin Port Ulwa-Belapur Ulwa-Belapur port Umarsadi Umarsadi port Umergaon Umergaon port Uttan Uttan port V.O. Chidambaranar Port Vadakara Vadakara port Vadarevu Vadarevu port Valinokkam Valinokkam port Valsad Valsad port Vansi-Borsi Vansi-Borsi port Vengurla Vengurla port Veraval Veraval port Versova Versova port Vijaydurg Vijaydurg port Visakhapatnam Visakhapatnam Port Vizag port Vizhinjam International Seaport Thiruvananthapuram port West Bengal port

Reviewed by Verified Maritime Technical Authority

Seanav Technical Engineering Board

Lead Marine Electronics Technical Superintendent

Senior technical marine electronics engineering board coordinating statutory SOLAS Chapter IV/V radio surveys, gyro compass overhauls, VDR APT certifications, and 24/7 technical riding squads across 170+ Indian commercial ports.

🛡️ SOLAS Marine Navigation & Communication Maintenance
🛡️ MCA Approved Magnetic Compass Adjustment Network
🛡️ GMDSS General Operator Certificate (GOC) Standards
🛡️ Surveys for All IACS & Non-IACS Classes via Channel Partners

🚨 24/7 Port & Anchorage Technical Dispatch

Calling at an Indian Port? Need Immediate Attendance or Spares?

Our factory-trained marine electronics engineers board vessels calling at all Indian major ports within 2–4 hours with bonded OEM spares:
JNPT (Nhava Sheva),
Mumbai,
Kandla,
Mundra,
Cochin,
Chennai,
Vizag, and
Paradip.
Statutory Class surveys coordinated for all IACS & Non-IACS classes through accredited channel partners across India.

Explore Statutory Scopes:
📡 GMDSS Radio Surveys
💾 VDR APT Certification
🧭 Gyro Compass Overhauls
🧲 Compass Adjustment
🛰️ Starlink Maritime

📞 Call Duty Engineer: +91 88508 49050
⚡ Request Attendance Quotation →