Seeking to enhance maritime security and interoperability, coast guard personnel from India, the Maldives and Sri Lanka have embarked on a four-day trilateral exercise to identify emerging maritime challenges in the Indian Ocean Region. Indian Coast Guard ship Samarth and ICGS Abhinav along with Sri Lanka Naval Ship Samudura reached here on Thursday for the exercise ‘DOSTI-16’ that is being held between February 22 and 25. Bangladesh is participating as an observer.