Return data works. Just need a reasonable way to get mlat data into the output plugins.

python/exceptions.py

@@ -44,4 +44,3 @@ class CPRBoundaryStraddleError(CPRNoPositionError):
 class FieldNotInPacket(ParserError):
     def __init__(self, item):
         self.item = item
-

python/mlat.py

@@ -113,7 +113,7 @@ def mlat_iter(stations, prange_obs, guess = [0,0,0], limit = 20, maxrounds = 100
         guess += xerr[:3] #we ignore the time error for xguess
         rounds += 1
         if rounds > maxrounds:
-            raise Exception("Failed to converge!")
+            raise MlatNonConvergeError("Failed to converge!")
     return (guess, xerr[3])
 
 #func mlat: