Full details of the application can be found on the revalidation page If training centres or shipping companies are approached by NMD certificate holders, they are advised to refer them to The Nautical Institute in the first instance, to advise them on what steps to take and to ensure that their accounts have been set up to accept their online applications.

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These tend to be much more basic than the solutions mentioned above, but if your needs are simple, they might do the job.