0 ▁Ton ▁license , ▁one ▁must ▁demonstrate ▁at ▁least ▁ 3 6 0 ▁days ▁of ▁service ▁( 9 0 ▁within ▁the ▁past ▁ 3 ▁years ) ▁on ▁any ▁vessel . ▁▁ ▁There ▁are ▁two ▁different ▁variables ▁in ▁this ▁license ; ▁t onn age ▁and ▁distance ▁off sh ore . ▁ ▁T onn age ▁granted ▁is ▁determined ▁by ▁the ▁t onn age ▁of ▁the ▁vessels ▁in ▁which ▁the ▁applic ant ' s ▁sea ▁time ▁is ▁declared . ▁ ▁Dist ance ▁off sh ore ▁is ▁one ▁of ▁five ▁possibilities ▁with ▁only ▁four ▁available ▁for ▁Char ter ▁Bo at ▁level ▁Cred entials : ▁R ivers ▁- ▁No ▁special ▁requirements ▁beyond ▁the ▁standard ▁ 3 6 0 ▁days . ▁In land ▁- ▁No ▁special ▁requirements ▁beyond ▁the ▁standard ▁ 3 6 0 ▁days . ▁Great ▁L akes ▁and ▁In land ▁- ▁For ▁this ▁s ublic ense , ▁ 9 0 ▁of ▁the ▁ 3 6 0 ▁days ▁declared ▁must ▁be ▁on ▁Great ▁L akes ▁waters . ▁Near ▁Coast al ▁- ▁For ▁this ▁s ublic ense , ▁one ▁must ▁demonstrate ▁the ▁standard ▁ 3 6 0 ▁days , ▁but ▁also ▁at ▁least ▁ 3 6 0 ▁additional ▁days ▁in ▁near - co ast al ▁or ▁ocean ▁waters . ▁O ce ans ▁- ▁This ▁end ors ement ▁is ▁not ▁available ▁for ▁Char ter ▁Bo at ▁level ▁Cred entials . ▁ ▁Mar in ers ▁wish ing ▁to ▁operate ▁vessels ▁beyond ▁the ▁restrictions ▁of ▁a ▁near ▁coast al ▁license ▁must ▁meet ▁the ▁requirements ▁for ▁the ▁ 2 0 0 ▁ton ▁license