I have 4+years of work ex in merchant navy and 1+ year in marketing of marine engines. i want to do mba in america or canada. Please tell me is my experience sufficient and helpfull for 1 and 1.5 year programs, fees, and which colleges i can look for. also scope for international business and executive mba. Course length not more than 18months !

You can search for one year programmes here: http://www.find-mba.com/search/ace00a2f/1

They will have different requirements.

When applying to MBA schools, each school will have different requirements and preferences for the candidates that they are looking for. The best advice that I can give you would be to compile a list of schools that you want to attend, then look up past statistics of accepted students. See if your profile matches and if so, apply!

What's your GMAT score? It will probably hinge on that. Maybe start by looking at these programs:

Canada:
Sauder
Concordia
Ryerson

USA:
Cornell, Accelerated MBA
Boston University
Rutgers

also scope for international business and executive mba.

I don't know what this means.

I think it means that this person is an Indian. In India, executive MBAs are often full-time one year programmes for people with several years works experience. Elsewhere, they are part-time programmes which - in North America - would be suitable only for people with residency.