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If I choose to exert my creature, this means that I dont untap it during my next untap step and gain the benefit on the card

Yes, this ability does synergize with Sail the Azurite Sea or other effects that allow inking a card. But, it does not work with the effect like Measure Me Again from Tipo Growing Son that allows a player to put a card from your hand into your inkwell. Inking a card is a verb and is specifically different from putting a card into your inkwell

Unsettled Mariner counters a spell or ability from your opponent unless they pay one generic mana

You even get two angel tokens to further buff your army, though angels wont gain indestructible this way