It’s actually quite simple. I always thought it was difficult and you’d have to learn from a code sheet, but I found an app which teaches you and you actually just recognise the sounds like you’d recognise any other sound. You generally don’t even need to decode it- you just get used to what a letter sounds like. I’ve been learning since Saturday and can already key my name out.
I only ever knew “SOS”. Learned it in Cub Scouts.
Apparently SOS isn’t actually the distress call. •••—••• just means a distress call, SOS is how people remember it. The difference between the distress call and SOS is that SOS would have a short pause to denote the beginning of s new letter, the distress call wouldn’t.
I learned it from old kitchen and bathroom cleaner commercials.