When I wanted to be an A license radio ham many moons ago you had to learn morse and pass the exam at 12wpm. I bought a random morse generator for about £15 and in 4 weeks I got up to exam speed. However you wont need anything like that speed for VOR/NDB/ILS interpretation. Its like riding a bike and I havent forgotten any of it. Probably still able to buy one from RADCOM the magazine of the RSGB.
