Home United States USCG MMC › You are here

USCG Credential Tonnage or Horsepower Limitation Removal Requirements for Master or Mate 1600 GT or More & Engineers 4000 HP or more

master mate tonnage limit removal

A mariner requesting for a national endorsement as master or mate of unlimited tonnage does not have the service on vessels of 1,600 GRT or more, a tonnage limitation will be placed on the MMC based on the applicant's qualifying experience.

For engineer licenses and endorsements, other than a DDE, the horsepower limitation placed on a license or MMC endorsement is based on the applicant’s qualifying experience considering the total shaft horsepower of each vessel on which the applicant has served.


If the USCG is satisfied by the documentary evidence, any limitations that were previously placed upon the MMC by the Coast Guard may be changed or removed. Such an increase in scope may include a change in horsepower or tonnage limitations, or geographic route restrictions.

The following are service requirements on vessels of 1600 GRT or 4000 horsepower or over which will be considered qualifying for the raising or removing of tonnage or horsepower limitations placed on an MMC license/endorsement.

tonage horsepower limitation

If the USCG is satisfied by the documentary evidence, any limitations that were previously placed upon the MMC by the Coast Guard may be changed or removed

Master/Mate or Engineer Limitation Removal General Requirements




  • Must have U.S. Citizenship
  • Approved Medical Certificate 

USCG Master / Mate Tonnage Limitation Removal Requirements

  • No applicant holding any national endorsement as Master or Mate of vessels less than 1600 GRT, less than 500 GRT, or less than 25-200 GRT may use these options to increase the tonnage of their endorsement. 
  • For Master 25-50 Tons & Mate 25-100 Tons increase in scope, you may refer this page

Sea Service Requirements

  • 180 days on vessels of 1600 GRT or more in the highest grade endorsed, all tonnage limitations will be removed, OR
  • 180 days of service on vessels of 1600 GRT or more in any capacity as an officer other than the highest grade endorsed, all tonnage limitations for the grade in which the service is performed will be removed and the next higher-grade endorsement will be raised to the tonnage of the vessel on which the majority of the service was performed, OR
  • Total cumulative service before and/or after the limitation was issued may be used to remove or raise all tonnage limitations by recalculating the original total required service -  All required service must be on vessels of 100 GRT or more; and 50% of the required service on vessels of 1600 GRT or more; and Recency is applicable, OR
  • 360 days of service as Able Seaman on vessels of 1,600 GRT or more while holding a license as Third Mate, all tonnage limitations on the third mate’s license will be removed

USCG Engineer Horsepower Limitation Removal Requirements

  • No applicant holding any national endorsement as Designated Duty Engineer may use these options to increase the horsepower of their endorsement

Sea Service Requirements

  • 180 days on vessels of 4,000 HP or more in the highest grade endorsed, all horsepower limitations will be removed, OR
  • 180 days of service on vessels of 4,000 HP or more as an engineer officer in any capacity other than the highest grade endorsed, all horsepower limitations for the grade in which the service is performed will be removed and the next higher-grade endorsement will be raised to the horsepower of the vessel on which the majority of the service was performed, OR
  • Total cumulative service before and/or after the limitation was issued may be used to remove or raise all horsepower limitations by recalculating the original total required service - 50% of the required service on vessels of 4,000 HP or more; and Recency is applicable, OR
  • 360 days of service on vessels of 4,000 HP or more as oiler or junior engineer while holding Third Assistant Engineer or Assistant Engineer (Limited), all horsepower limitations on the third assistant engineer’s endorsement will be removed, OR
  • 180 days of service on vessels of 4,000 HP or more as oiler or junior engineer while holding Second Assistant Engineer, all horsepower limitations on the Third Assistant Engineer’s endorsement will be removed

You may also read:

Disclaimer: For general information purpose - please check with USCG for the latest requirements and accurate info