As usual TakeFive is correct.. the blue-light won't work in some nav lights.
HOWEVER, you might be able to get the right "color" out of your LED nav lights if you get the right "white" out of your LEDs.
Look for a fuller spectrum white (warm white) LED and you might still be A-OK.
I know when I bought my PERKO replacement bulbs, they were certified for this use, still a bargain, and fit into this "low buck project" thread.
NO I am not working for this company.. and I am sure you can buy them elsewhere.
Perko Atwood Hella 31mm Festoon LED Replacement Bulbs