I am sorry I should of gave more info.. I was refering to the 30 north line above huron.. It would be the middle number on the top line of your gps lat and long. It would look like this.
41.30.356 North Lat. line
82.35.135 West Long. line
This is example not the exact numbers where the fish are.. They move around everyday..
So if you heard someone on the radio say the 30/35 that would be the middle numbers of the above example. I am very sorry I was not clearer