Equivalent to IPX7 (1m depth for 30 minutes, except cables). Shows full size channel number with 4-step backlighting. For distress calls, or for position request/position report. Delivers impressive audio output with powerful bass. Offers quick channel selection from the microphone up/down buttons. The vibrating buzz sound clears water away from the speaker grill. Listen for important weather broadcasts. Monitors Ch.16 and/or call channel, while using another channel.