I have a 500 tn master/ 1600 tn mate inland. Does anyone know what kind of sea time I would need to turn my mate into a 1600 tn master. I cant get a clear answer from the coast guard.
Your 500 master should turn into 1600 master with a year of sea time as mate or master after receiving the 500.
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You can get a clear answer in the CFR. If you are aspiring to Master you should learn how to use it.
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Look up the requirements for 1,600 ton Master in the CFR. 
It would be nice if the NMC could create a checklist for things like this, then he wouldn’t need to read the CFRs…
Sarcasm didn’t take.
The checklists on the NMC site are fairly straight forward) even if the requirements aren’t) and have CFR references.
46 CFR 11.442 Requirements for master of Great Lakes and inland self-propelled vessels of less than 1,600 GRT.
(a) The minimum service required to qualify an applicant for an endorsement as master of Great Lakes and inland self-propelled vessels of less than 1,600 GRT is—
(1) Three years of total service on vessels. Eighteen months of the required service must have been on vessels of 100 GRT or more. One year of the required service must have been as a master, mate, or equivalent position on vessels of 100 GRT or more while holding a license or MMC endorsement as master, mate, or master of towing vessels; or
(2) Six months of service as operator on vessels of 100 GRT or more while holding a license or MMC endorsement as master of towing vessels.