A unique website dedicated to fishing information from Florida's Northern Big Bend. This includes the area from the Econfina River west to the Apalachicola River
I have the Garmin 176c, so not sure if it's set up like yours but will be glad to help you. I did that on mine last week. I initially messed up when I didn't set the correct chain number and secondary stations. But when I entered those correctly it worked fine.