at sea

on the open ocean; in a state of confusion, perplexed

An ocean (from , Okeanos (Oceanus) in Greek) is a major body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface (an area of some 361 million square kilometers) is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas. More than half of this area is over 3,000 meters (9,800 ft) deep. Average oceanic salinity is around 35 parts per thousand (ppt) (3.5%), and nearly all seawater has a salinity in the range of 31 to 38 ppt.
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Adjective
1. perplexed by many conflicting situations or statements; filled with bewilderment; "obviously bemused by his questions"; "bewildered and confused"; "a cloudy and confounded philosopher"; "just a mixed-up kid"; "she felt lost on the first day of school"
(synonym) baffled, befuddled, bemused, bewildered, confounded, confused, lost, mazed, mixed-up
(similar) perplexed
2. traveling by boat or ship
(synonym) at sea(p), sailing
(similar) afloat(p)

Synonyms and related words:
abashed, abroad, adrift, afloat, astray, bewildered, bothered, by sea, by water, clueless, confused, discomposed, disconcerted, dismayed, disoriented, distracted, distraught, disturbed, embarrassed, guessing, homeward bound, in a fix, in a maze, in a pickle, in a scrape, in a stew, in blue water, in soundings, lost, making way, mazed, off soundings, off the course, off the heading, off the track, perturbed, put-out, turned around, under bare poles, under sail, under way, upset, with sails spread, with way on, without a clue,
  

IN MARE. IN NAVIGAZIONE. CONFUSO. IMBARAZZATO. PERPLESSO. IN ALTO MARE