diff --git a/nav.py b/nav.py
index f781d98..8f4ec88 100644
--- a/nav.py
+++ b/nav.py
@@ -21,6 +21,7 @@ DISTANCES = {
     ("ceres", "vesta"): 96.0,
     ("ceres", "europa"): 404.0,
     ("europa", "io"): 0.25,
+    ("europa", "ganymede"): 0.4,
 }
 
 # Every route starts at Earth.
@@ -36,6 +37,7 @@ ROUTES = {
     "vesta": ["earth", "gateway", "mars", "ceres", "vesta"],
     "europa": ["earth", "gateway", "mars", "ceres", "europa"],
     "io": ["earth", "gateway", "mars", "ceres", "europa", "io"],
+    "ganymede": ["earth", "gateway", "mars", "ceres", "europa", "ganymede"],
 }
 
 NAMES = {
@@ -52,6 +54,7 @@ NAMES = {
     "vesta": "Vesta",
     "europa": "Europa",
     "io": "Io",
+    "ganymede": "Ganymede",
 }
 
 CRUISE_SPEED = 0.87  # million km per day