Numerous reminders to mariners have come from rescue agencies that the Coast Guard will cease monitoring the 121 MHz radio frequency for EPIRBs Feb. 1. On the eve of the transition, BoatU.S. reminds coastal and inland boaters planning offshore passages that the organization rents out 406 MHz EPIRBs the Coast Guard will continue to monitor. Click here to learn more about the rentals from BoatU.S. Click here to learn more about EPIRBs.