Точнее, понятно, что речь идет о "мореходности" и "пригодности", но сам глагол admit вызывает у меня непонимание в данном контексте

Например,

The Assured are not to be prejudiced by the presence of the negligence clause and/or latent
defect clause in the Bills of Lading and/or Charter Party. The seaworthiness of the vessel as
between the Assured and this Company is hereby admitted and the wrongful act or misconduct
of the shipowner or his servants causing a loss is not to defeat the recovery by an innocent
Assured if the loss in the absence of such wrongful act or misconduct would have been a loss
recoverable on the Policy.