Saipan is located at latitude of 15.25 Â north and longitudeof 145.75 Â east , about 200 km ( 120 mi ) north of Guam . Located at latitude of 15.25 Â north and longitude of 145.75 Â east , about 120 m north of Guam , Saipan is about 12 m long and 5.6 m wide .