I got some good feedback and participation on my last puzzle I posted, so here is a new one for you to grind your brains on. This one is...

... Well, that smiley says it all...
Individual letters are separated by slashes.
As per usual, decipher the riddle first, then apply that info to the code.
The riddle:
Two units of three, pirate map's marker, and the lesser of pound reveals ::: not quite all... Or you could ask Eta Onir. She has the answer.
The code:
-5.5/2/-7.5/-0.5/-1/-3.5/1/1.5/-4/-2/-6/-6.5/2.5/0/-5/-1.5/3.5/4.5/-7/-4.5/3/-2.5/0.5/4/-3/5
A hint:
A=1, B=2, etc.
Have fun!