This is the Northeast GRI. It is used on the East Coast from Cape Fear North Carolina Northward.
W Represents Microseconds from 13000 to 15000
X Represents Microseconds from 25000 to 28000
Y Represents Microseconds from 38000 to 44000
Z Represents Microseconds from 57000 to 58000
Since most of us here around New York use the X & Y stations, I would input the X & Y td's for your nearest inlet or port. Otherwise, just input any number that falls within the range for each station. The unit should then figure out where you are.
W Represents Microseconds from 13000 to 15000
X Represents Microseconds from 25000 to 28000
Y Represents Microseconds from 38000 to 44000
Z Represents Microseconds from 57000 to 58000
Since most of us here around New York use the X & Y stations, I would input the X & Y td's for your nearest inlet or port. Otherwise, just input any number that falls within the range for each station. The unit should then figure out where you are.