The IMO has given the following guidelines for “Officers in
Charge of a Navigational Watch”, with regard to the proper use of radar.
1 The officer of the watch should use radar when appropriate and whenever restricted visibility is encountered or expected and at all times in congested waters having due regard to its limitations.
2 Whenever radar is in use, the officer of the watch should select an appropriate range scale, observe the display carefully and plot effectively.
3 The officer of the watch should ensure that range scales employed are changed at sufficiently frequent intervals so that echoes are detected as early as possible and that small or poor echoes do not escape attention.
4 The officer of the watch should ensure that plotting or systematic analysis is commenced in ample time, remembering that sufficient time can be made available by reducing speed if necessary.
5 In clear weather, whenever possible, the officer of the watch should carry out radar practise.