天津大海电信科技有限公司

　　甚高频IC-M304
　　Compact and submersible
　　Equivalent to IPX7 (1m depth for 30 minutes, except cables).
　　Large easy-to-see LCD
　　Shows full size channel number with 4-step backlighting.
　　Built-in DSC (RTCM SC-101)
　　For distress calls, or for position request/ position report.
　　Force5Audio? speaker
　　Delivers impressive audio output with powerful bass.