Question: In [Triangle](http://www.imdb.com/title/tt1187064/), at the start when Jess arrives at the boat for the "first" time, is this the start of the continuation of the ending scene?

It's known that the cruise ship and any surroundings after leaving it is in a time loop.

Though Jess remembers the ship and tells Greg, she makes no indication that she is in the time loop. So yes, the movie was meant to confuse the user. But seeing that, according to the number of dead Sallys on board, the time loop occurs more than 20 times.

So, the first time she entered the loop, the storm sent her into an alternate reality with the never-ending time loop? Is this what the movie was showing? I noticed there is a deadly Jess that was not really in the foreground that got shot in the head, and stabs Sally and Downey in one of the rooms. I cannot really place where she falls into the picture seeing that one of the previous Jess instances killed that Jess instead of letting her jump overboard.

So is there a separate timeline/reality?

Answer: 
The only thing possible to break out from the same-things-happening time loop is the "knowledge" of the previous loop, so that she can change them. I think she loses it all while she falls asleep on the boat, waking up with champagne and all.

All time bending movies have their inconsistencies somewhere. They're good for entertainment purpose only, and Triangle is one of my favorites.
I think, that the time repeats itself because Jess does not want to let go of her son. When they are sitting on their yacht, after the storm, she says that "If I do something differently, I'll loose him (her son)", and therefore she lets the story happen over and over again. Also I believe that the taxi driver is the death or maybe a saviour as it would all end -her son would die, she would die- if she stayed in the taxi. At least that's how I understood it.