 During World War II The German Navy deployed weather buoys ( Wetterfunkgerät See — WFS ) at fifteen fixed positions in the North Atlantic and Barents Sea . They were launched from U @-@ boats into a maximum depth of ocean of 1000 fathoms ( 1 @,@ 800 metres ) , limited by the length of the anchor cable . Overall height of the body was 10 @.@ 5 metres ( of which most was submerged ) , surmounted by a mast and extendible aerial of 9 metres . Data ( air and water temperature , atmospheric pressure and relative humidity ) were encoded and transmitted four times a day . When the batteries ( high voltage dry @-@ cells for the valves , and nickel @-@ iron for other power and to raise and lower the aerial mast ) were exhausted , after about eight to ten weeks , the unit self @-@ destructed . 
 During World War II The German Navy deployed weather buoys ( Wetterfunkgerät See — WFS ) at fifteen fixed positions in the North Atlantic and Barents Sea . They <a href='uninflect' title='1'><mark>were</mark></a> launched from U @-@ boats into a maximum depth of ocean of 1000 fathoms ( 1 @,@ 800 metres ) , limited by the length of the anchor cable . Overall height of the body was 10 @.@ 5 metres ( of which most was submerged ) , surmounted by a mast and extendible aerial of 9 metres . Data ( air and water temperature , atmospheric pressure and relative humidity ) <a href='uninflect' title='2'><mark>were</mark></a> encoded and transmitted four times a day . When the batteries ( high voltage<a href='been_done' title='3'><mark></mark></a> <a href='uninflect' title='4'><mark>dry</mark></a> @-@ cells for the valves , and nickel @-@ iron for other power and to raise and lower the aerial mast ) <a href='uninflect' title='5'><mark>were</mark></a> exhausted , after about eight to ten weeks , the unit self @-@ destructed . 
Durin World War II da German Navy deployed weather buoys ( Wetterfunkgerät See — WFS ) at fifteen fixed positions in tdaNorth Atlantic and Barents Sea . They was launched from U @-@ boats into a maximum depth of ocean of 1000 fathoms ( 1 @,@ 800 metres ) , limited by the length of thdanchor cable . Overall height of the body was 10 @.@ 5 metres ( of which most was submerged ) , surmounted by a mast and extendible aerial of 9 metres . Data ( air and water temperature , atmospheric pressure and relative humidity ) was encoded and transmitted four times a day . When the batteries ( high voltage done dried @-@ cells fir the valves , and nickel @-@ iron for other power and to raise and lower thedarial mast ) was exhausted , after bout eight to ten weeks , the dat self @-@ destructed .