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Hmm ... when I get folks in for physicals for the merchant marine, the vision tests are more extensive.
Although for truckers, testing for red/amber/green is all that's required. You can use a high-tech expensive Titmus machine, or you can provide ten or fifteen pieces of yarn in different colors (that include the above three) and ask the candidate to pick out red, amber, and green. It doesn't have to be high-tech, just reasonably accurate.
If the lamps are the precise thing encountered at sea, carry on. If not, testing should probably be a bit more specific.
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The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi 
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