Calculating GRT for Mariner Credentials

[Capt_Phoenix]

@chuckspence

Many years ago, I was referred to the Gross Register Tonnage regulation of small vessel calculations if it was unknown.

It’s not unknown…

@PilotPat24

So if I am working an a vessel that’s only calculated with the simplified tonnage

You’re not.

@PilotPat24

how does this type of Vessel Gross Tonnage work when looking to upgrade your license when the Sea Service for the vessels needs to be in Gross Registered Tonnage?

It doesn’t need to be in GRT.

@PilotPat24

Would the 137 Gross Tons vessel I work on satisfy a Sea Service requirement that’s calling for time on vessels of 100 GRT or more?

Probably.

@PilotPat24

The “SIMPLIFIED MEASUREMENT GROSS TONNAGE” formulas?

No, did you bother read the CFR citation jdcavo linked earlier?

@jdcavo

See also 46 CFR 11.211(h) .

[chuckspence]

If this thread was about filling out the vessel gross tonnage on the CG 719S form. Using the NMC guidance document for filling out the form it states:

“Vessel Gross Tons: To receive credit toward endorsements with tonnage limitations of
over 25 GRT, the applicant must supply the GRT (water displacement) of the vessel on
which they are claiming service. If unsure of the GRT of the vessel, please be sure to
provide the width, length, and depth of the vessel on this form. All three measurements
are required so that displacement may be calculated for you.”

[PilotPat24]

@jdcavo

See also 46 CFR 11.211(h) .

I was just able to read it thoroughly. Looks like my time on this vessel will count as GRT! That’s great news!