1.1 Studies on a worldwide radionavigation system
have been taking place since 1983. These studies have provided a basis
on which chapter V of the 1974 SOLAS
Convention has been amended to include a requirement for ships to
carry means of receiving transmissions from suitable radionavigation
systems throughout their intended voyage.
1.2 The operational requirements for worldwide
radionavigation systems are given in the appendix.
1.3 It is not considered feasible for IMO to fund
a worldwide radionavigation system. Existing and planned systems which
are being provided and operated by Governments or organizations have
therefore been studied, in order to ascertain the conditions under
which such systems might be recognized or accepted by IMO.