diff --git a/nav.py b/nav.py
index f7d8ba0..fdca11a 100644
--- a/nav.py
+++ b/nav.py
@@ -88,7 +88,7 @@ def legs(route: list[str]) -> Iterator[tuple[str, str]]:
         yield route[i], route[i + 1]
 
 
-def plan(destination: str) -> tuple[list[str], float, float, float]:
+def plot_course(destination: str) -> tuple[list[str], float, float, float]:
     """Return route, distance, travel time (days) and fuel (t)."""
     route = ROUTES[destination]
     total = 0.0