Agreed 100%Get a radio ! Not just for the added saftey but listening channel 68 has put fish in my boat. They make some small/cheap ones now. Also cell coverage no worth a damn in many spots on the lake. Careful out by the light house or you may get a big bill because you've roamed to a US cell tower.
Just saying in a Mayday situation, time is of the essence, *16 is also an option for direct contact with Coast Guard.