# GRT/NRT has been replaced by GT/NT in all international trade since 1982

**URL:** <https://forum.gcaptain.com/t/grt-nrt-has-been-replaced-by-gt-nt-in-all-international-trade-since-1982/68323>\
**Category:** Professional Mariner Forum\
**Created:** [February 3, 2024, 4:47pm UTC](https://forum.gcaptain.com/t/grt-nrt-has-been-replaced-by-gt-nt-in-all-international-trade-since-1982/68323 "2024-02-03T16:47:14Z")\
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**Author:** ![ombugge](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/ombugge/32/11217_2.png) [@ombugge](https://forum.gcaptain.com/u/ombugge)\
**Post date:** [February 3, 2024, 4:47pm UTC](https://forum.gcaptain.com/t/grt-nrt-has-been-replaced-by-gt-nt-in-all-international-trade-since-1982/68323/1 "2024-02-03T16:47:14Z")

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GRT/NRT has been replaced by GT/NT in all international trade since 1982.  
GT/NT is the basis for calculating port due, canal fees, pilotage charges etc. all over the world. (incl. for foreign flag ships calling US ports.)

How is this solved for those US-flag ship that is only measured in GRT/NRT if/when they call at foreign ports, or use foreign canals and waterways?

PS\> I believe US-flag ships in regular foreign trade are measured in GT/NT, or have dual tonnage?

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