Back in them thar old days, they be EPIRB beacons, arr, but only could be turned on when that thar boat be two metres below them thar waves. That be because there b'aint be no bracket what fit but those thar 'hydrostatic release unit' widgets. That be because Cap'n Andresson were somewhat of a tightwad, arr. They be called 'face saving beacons' so's not to hurt his them thar feelings when some whippersnapper try tellin' Cap'n they be automatically activated ones. This because every time anyone asked, he be telling 'em they be manually hoperated. So as time came to pass these here HRU free float Epirbs came to be known on Cap'n Andresson's ship as manually activated and because it involved sailors diving into the them thar sea he be putting a man-overboard beacon beside it in case them thar jacktar failed to resurface.