9 8 0 ▁Irish ▁OP V s ▁including ▁Ireland ' s ▁latest ▁order ▁for ▁a ▁stretch ed ▁ 9 0 - met re ▁OP V ▁or ▁upgrad ed ▁sens ors ▁given ▁that ▁military ▁and ▁civil ian ▁threat ▁to ▁territorial ▁thre ats ▁to ▁the ▁E E Z ▁and ▁N Z ▁cannot ▁be ▁precisely ▁differenti ated . ▁In ▁reality ▁the ▁ice - str ength ened ▁bel t ▁resulted ▁in ▁the ▁OP V s ▁being ▁ 3 0 0 ▁tons ▁over weight ▁and ▁required ▁much ▁time ▁and ▁$ 8 4 ▁million ▁exp end iture ▁to ▁modify . ▁H M N Z S ▁Well ington ▁performed ▁well ▁in ▁sea ▁state ▁ 7 / 8 ▁in ▁the ▁Ross ▁Ice ▁Sh elf ▁in ▁app alling ▁conditions ▁in ▁February ▁ 2 0 1 2 ▁but ▁still ▁has ▁only ▁half ▁the ▁margin ▁of ▁the ▁ordered ▁specific ations , ▁limit ing ▁future ▁modern isation ▁and ▁service ▁life , ▁given ▁the ▁in ev itable ▁increase ▁in ▁weight ▁during ▁the ▁course ▁of ▁war ships ▁life . ▁Also ▁at ▁issue ▁was ▁a ▁third ▁OP V ▁rather ▁than ▁the ▁IP V s ▁strongly ▁back ed ▁by ▁Ministry ▁of ▁Fish eries ▁and ▁Def ence ▁Minister , ▁Phil ▁G off , ▁which ▁lack ed ▁military ▁relev ance ▁other ▁than ▁reserve ▁and ▁command ▁training . ▁ ▁Names ▁On ▁ 3 1 ▁March ▁ 2 0 0 6 , ▁Minister ▁of ▁Def ence ▁Phil ▁G off ▁announced ▁that ▁the ▁OP V s ▁will ▁be ▁named ▁H M N Z S ▁O tag o ▁and ▁H M N Z S ▁Well