I read that act done after crossing the seas would yield no fruit.
I also heard many Gurus in India do not travel abroad. Why is this restriction?
Rama crossed the ocean but you may say it's through bridge. But Ravana, crossed it to kidnap Sita in Vimana. He is one of the greatest Brahmin with all the knowledge to know what is good. Rama also his return to Ayodhya came in Vimana, flying over the ocean.