diff --git a/engine.py b/engine.py
index 229458e..1b2f492 100755
--- a/engine.py
+++ b/engine.py
@@ -96,13 +96,13 @@ def trilat_error(stations: list[StationT], position: tuple[float, float]) -> flo
     return sum(sq_errors) / len(sq_errors)
 
 
-def trilaterate(stations: list[StationT]) -> tuple[float, float]:
+def trilaterate(stations: list[StationT], disp: bool = False) -> tuple[float, float]:
     """Trilaterate a position, given a list of stations.
 
     Each station is of the format ((lat, lon), distance).
     """
 
-    return scipy.optimize.fmin(lambda pos: trilat_error(stations, pos), (0., 0.))
+    return scipy.optimize.fmin(lambda pos: trilat_error(stations, pos), (0., 0.), disp=disp)
 
 
 def encode(location: tuple[float, float]) -> EncodedLocation:
@@ -131,7 +131,7 @@ def encode(location: tuple[float, float]) -> EncodedLocation:
     return result
 
 
-def decode(location: EncodedLocation) -> tuple[float, float]:
+def decode(location: EncodedLocation, disp: bool = False) -> tuple[float, float]:
     """Decode into a location."""
 
     # form the distances matrix
@@ -161,7 +161,7 @@ def decode(location: EncodedLocation) -> tuple[float, float]:
 
     # part 2: trilaterate
     stations: list[StationT] = [(greggs_raw[g], location[i][0]) for i, g in enumerate(closest_greggs)]
-    return trilaterate(stations)
+    return trilaterate(stations, disp=disp)
 
 
 def format_dist(dist: float) -> str:
@@ -199,7 +199,7 @@ def main():
     parsed = parse_location(formatted)
     print("Parsed:", parsed, end="\n\n")
 
-    decoded = decode(encoded)
+    decoded = decode(encoded, disp=True)
     print("Decoded:", decoded, end="\n\n")
 
     error = spherical_dist(np.array(coords), np.array(decoded))