TY  - BOOK
AU  - Tetley,L.
AU  - Calcutt,D.
TI  - Electronic aids to navigation: position fixing 
SN  - 0340543809
PY  - 1991///
CY  - London
PB  - Edward Arnold
KW  - Electronics in navigation
KW  - Navigation
KW  - Equipment and supplies
KW  - Safety measures
ER  -