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3rd Assistant information

What is a 3rd assistant?

A 3rd Assistant, often referred to as a Third Assistant Engineer or Third Mate depending on the department, is a junior officer on a ship responsible for assisting senior officers with the operation, maintenance, and safety of the vessel. In engineering, they help monitor machinery and conduct routine maintenance, while in the deck department, they assist with navigation, watchkeeping, and cargo operations. This position is typically an entry-level officer role for those starting their career at sea after obtaining the necessary certifications.

What are the typical responsibilities of a 3rd assistant on a ship?

As a 3rd Assistant, also known as a Third Mate, you are responsible for maintaining navigational watches, ensuring the safe operation of the vessel, and assisting with cargo operations. You will work closely with other deck officers and crew to monitor safety equipment, maintain logbooks, and conduct regular inspections. This role often serves as a stepping stone for career advancement, providing hands-on experience in navigation, ship management, and leadership under the guidance of senior officers.

What are the key skills and qualifications needed to thrive as a 3rd assistant?

To thrive as a 3rd Assistant (commonly in maritime or film industries), you generally need a relevant educational background, such as maritime certifications or film production coursework, and a basic understanding of operations and safety protocols. Familiarity with industry-specific tools—like navigational equipment for maritime roles or scheduling and communication software for film—is essential. Strong organizational skills, attention to detail, and the ability to work well in a team set outstanding candidates apart. These skills are vital to ensure smooth operations, support senior staff, and contribute to the overall success of projects or voyages.

What is the difference between 3Rd Assistant vs 2Nd Assistant?

Aspect3Rd Assistant2Nd Assistant
Required CredentialsHigh school diploma, relevant certificationsHigh school diploma, additional certifications often preferred
Work EnvironmentAssistants work in offices, clinics, or service settingsSimilar environments, often with more direct responsibilities
Employer & Industry UsageCommon in healthcare, legal, administrative sectorsUsed in similar industries, with increased responsibilities
Comparison FocusEntry-level support roleMore experienced support role with additional duties

The 3Rd Assistant typically performs foundational support tasks, while the 2Nd Assistant handles more complex responsibilities. The main difference lies in experience level and scope of duties, with the 2Nd Assistant often requiring more certifications and offering greater support within the team.

What does a 3rd assistant engineer do?

A 3rd assistant engineer is responsible for supporting the engineering team by performing routine maintenance, monitoring equipment, and assisting with repairs on ships or industrial facilities. They typically work under the supervision of senior engineers and need relevant certifications such as a third assistant engineer license. The role often involves shift work and requires knowledge of safety protocols and technical systems.

What cities are hiring for 3Rd Assistant jobs?

Cities with the most 3Rd Assistant job openings:

What are the most commonly searched types of 3Rd jobs?

The most popular types of 3Rd jobs are:

What are popular job titles related to 3Rd Assistant jobs?

For 3Rd Assistant jobs, the most frequently searched job titles are:

3rd Assistant jobs near you
Infographic showing various 3Rd Assistant job openings in the United States as of September 2026, with employment types broken down into 80% Full Time, and 20% Part Time. Highlights an 100% In-person job distribution.

3rd Assistant Engineer

Glen Arbor, MI • On-site

Grand River Navigation Company
See more jobs at Grand River Navigation Companyexternal

Other

Medical, Dental, Vision, Life, Retirement

Posted 15 days ago

Key responsibilities

  • Assist with the operation, monitoring, and maintenance of propulsion, auxiliary, and mechanical systems.

  • Perform routine inspections of engine room equipment and report deficiencies to senior engineering officers.

  • Assist with preventative maintenance, repairs, and troubleshooting of vessel machinery.

Job description

Description:

Come Sail with us on the Great Lakes!


If you are looking to become part of our team that strongly values safety, efficient operations, a family-oriented environment, come sail with us! Grand River Navigation has one of the best leave and rotation systems on the Great Lakes. With unprecedented teamwork and some of the most talented colleagues in the industry we can guarantee you will enjoy a career with us!


Grand River Navigation Company is the U.S. operating subsidiary of Mainstay Maritime. We are one of the largest marine transportation service providers operating on the Great Lakes today with a combined fleet of 15 bulk freight vessels that provide service to over 50 customers across the Great Lakes and St. Lawrence Seaway.


Competitive total rewards package including income, paid travel to/from the vessel, healthcare benefits, retirement savings plans and work/life balance with best-in-class rotation. We have many education opportunities and upgrade bonuses to support career growth at a pace that is right for each individual.


"We can go where the big ships go and also where they can't!"


Our Company is searching for qualified candidates for the position of 3rd Assistant Engineer aboard our US flagged self-unloading vessels.

Responsibilities

  • Assist with the operation, monitoring, and maintenance of propulsion, auxiliary, and mechanical systems.
  • Perform routine inspections of engine room equipment and report deficiencies to senior engineering officers.
  • Assist with preventative maintenance, repairs, and troubleshooting of vessel machinery.
  • Maintain engineering logs, maintenance records, and equipment documentation.
  • Support fuel transfers, lubrication programs, and inventory management of engineering supplies.
  • Maintain cleanliness and safety standards in engine room and machinery spaces.
  • Participate in emergency drills and respond to vessel emergencies as assigned.
  • Comply with company safety policies, environmental regulations, and vessel operating procedures.
  • Assist with drydock projects, equipment overhauls, and regulatory inspections.
  • Perform other duties as assigned by senior engineering officers to support safe and efficient vessel operations.

Benefits

  • As an employee, you are part of the Mainstay Maritime family where teamwork and safety are core values
  • Highly competitive wages and benefits including medical, dental, vision, company paid long-term and short-term disability and life insurance, 401K with company match
  • Excellent companywide safety record
  • Company paid training and education opportunities


Job Type: Full Time - Permanent


Requirements:
  • TWIC Card - Transportation Worker Identification Credential
  • United States Merchant Mariners Credential (MMC) issued by the United States Coast Guard (USCG)
  • MMC Endorsement as 3rd Assistant Engineer of Motor Propelled Vessels Unlimited Horsepower
  • Unexpired US Passport or Enhanced Driver's License and allowed entry into Canada
  • Legally authorized to work in the US, without restriction
  • Excellent communication and ability to multi-task
  • Experience working as a team and desire to working together as a team player
  • Experience and desires to align to our Values: Creating a Positive Customer Experience, Health/Safety/Environment focused, High Integrity and Teamwork

Grand River Navigation is an Equal Opportunity Employer All qualified applications will receive consideration for employment without regard to age, race, creed, color, national origin, ancestry, marital status, affectional or sexual orientation, gender identity or expression, disability, nationality or sex, marital status, genetic information, protected veteran status, or any other status protected by law. We also comply with Family Medical Leave Act and Employee Rights Employee Polygraph Protection Act.


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