Otomat missile comes in two version.

French one dive high to get a preliminary look and after dive down, Italian one envisaged the use of an helicopter to made a mid-course update.

Missile doesn’t need external guidance to operate however, on smaller ranges it function as all other sea skimming missile does.
It was instead a way to compensate the target movements until the missile would have reached close enough to use its own radar, helicopter would so make just a brief popup, register target new position and correct missile course and dive down the radar horizon. again.
AFAIK only Lybian 550 corvettes used Otomat without having provisions for an helo aboard, [I]Minerva[/] never had it.