TY  - BOOK
TI  - Global Maritime Distress and Safety System : : General Operator's Certificate / 
U1  - 623.856 23
PY  - 1996///.
CY  - Mumbai : 
PB  - Mysoprints, 
KW  - Merchant mariners -- Training of.
KW  - Navigation -- Safety measures.
KW  - Radio in navigation.
ER  -