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°×µÀб¶È obliquity of the moon path
Õڹ⻡ obscured sector
Íâ¹Û¼ì²é observation check
¹Û²â¸ß¶ÈÐÞÕý observed altitude correction
¹Û²âÃÜ¶È observed density
¹Û²âγ¶È observed latitude
¹Û²â´¬Î» observed position {= OP}
ÕÏ°Îï̽²â obstruction sounding
ÑóÁ÷ͼ ocean current chart
º£Ñó¼à²â´¬ ocean monitoring ship
´óÑóº½ÐÐ ocean navigation
´óÑóº½Â· ocean passage
ÑóÇøÂë ocean region code
ÑóÇø ocean regions
´óÑóË®Éîͼ ocean sounding chart
º£ÑóÆøÏ󱨸æ ocean weather report
´óÑó²âºò´¬ ocean weather vessel
º£Ñó¹¤³Ì oceaneering
º£Ñóµ÷²é´¬ oceanographic research vessel
Æ«ÐÄÏÔʾ off-centered display
Æ«ÐÄ off-centering
Í£×⣻½â×⣻Àë×â off-hire
Í⺣ÓæÒµ off-sea fishery
À밶ê offshore anchor
½üº£ÇøÓò offshore area
½üº£Á¬½Ó offshore connection
½üº£×ê̽×÷Òµ offshore drilling operation
½üº£µºÓ죻À뵺 offshore islands
½üº£º½ÐÐ offshore navigation
½üº£Æ½Ì¨ offshore platform
½üº£²âÁ¿ offshore survey
½üº£×°Ð¶Õ¾ offshore terminal
Í⺽· offshore tracks
À¹ÓÍË÷ oil boom
ȼÓÍÆ÷ oil burning unit
ÂËÓÍÉ豸 oil filtering equipment
¼ÓȼÓÍÕ¾ oil fuel filling station
ȼÓÍ×°±¸×é oil fuel unit
ÓÍÂí´ï oil motor
ÓÍÎÛÏÕ oil pollution risk
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