Walaykum salam wa-rahmutAllah wa-barakatuhu brother. Is I was in your position I would try to find an alternative, or consult a sheikh directly.
From this website:
Friday prayer is compulsory for all except a few. A very clear hadith on this matter is given below:
It was reported from Tariq bin Shihab from the Prophet (PBUH), that he said: “The Friday prayer in congregation is an obligation on every single Muslim, except for four: an owned slave, a woman, a child and a sick person.”
(Hadith No. 1067, Book of Salat, Sunan Abu Dawud, Vol. 1).
From your description it sounds as though you do not fit any of those four types of people.
There are exceptions however:
It is permissible for a person not to go to Masjid for congregational Friday prayers if it is raining. Refer to following hadith:
Narrated Muhammad bin Sirin: On a rainy day Ibn Abbas (RA) said to his Muadh-dhin, “After saying ‘Ash-hadu anna Muhammadun Rasool-Allah‘, do not say ‘Haiya alas-Salah (Come for Salat)’, but say: ‘Sallu fi Baytikum (Offer Salat in your houses).” The man did so, but the people disliked it. Ibn Abbas (RA) said, “It was done by one who was much better than I (i.e. Prophet, PBUH). No doubt, the Juma’a prayer is compulsory but I dislike putting you to task by bringing you out walking in mud & slush.”
(Hadith No. 901, Book of Al-Juma’a, Sahih Bukhari, Vol. 2).
And also if eid falls on this day, but the scholars are not in agreement whether that means you do not have to pray dhur either.
One further hadith about the dangers if missing Friday prayer:
It was narrated from Abdullah bin Umar (RA) and Abu Hurairah (RA) that they heard Allah’s Messenger (PBUH) say, on the planks of his Minbar, “People must cease neglecting Juma’a (prayers), or else Allah will put a seal over their hearts and they will truly be among the negligent.”
(Hadith No. 2002 (865), Book of Friday Prayer, Sahih Muslim, Vol. 2).
So you can see the danger.
So, my conclusion, and may Allah forgive me if I am mistaken, is that it would be better to attend Juma'a prayer that continue in your fishing profession, unless you can find a route that takes you back to shore more regularly.
As for a traveller, the below quote from here says:
It is preferable for the traveller to attend Jumu’ah, because this is better, and is on the safe side (because some scholars think that Jumu’ah is obligatory for the traveller who is staying in a particular place, but not for the traveller who is on the road), as he comes under the general meaning of the aayah (interpretation of the meaning): “O you who believe! When the call is proclaimed for the Salaah on the Day of Friday (Jumu’ah prayer), come to the remembrance of Allaah, and leave off business (and every other thing), that is better for you, if you did but know!” [al-Jumu’ah 62:9].
But as your are travelling for business, I would be wary of leaving it.
I'll leave you with this story from Yusha Evans, who quit his job to attend Juma'a and in the same day got a new job: