diff --git a/package-lock.json b/package-lock.json
index af8074f..0b5072c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1395,6 +1395,1337 @@
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+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/topojson-server/-/topojson-server-3.0.1.tgz",
+      "integrity": "sha512-/VS9j/ffKr2XAOjlZ9CgyyeLmgJ9dMwq6Y0YEON8O7p/tGGk+dCWnrE03zEdu7i4L7YsFZLEPZPzCvcB7lEEXw==",
+      "requires": {
+        "commander": "2"
+      }
+    },
     "touch": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
@@ -8118,6 +9571,11 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "turf-jsts": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/turf-jsts/-/turf-jsts-1.2.3.tgz",
+      "integrity": "sha512-Ja03QIJlPuHt4IQ2FfGex4F4JAr8m3jpaHbFbQrgwr7s7L6U8ocrHiF3J1+wf9jzhGKxvDeaCAnGDot8OjGFyA=="
+    },
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
diff --git a/package.json b/package.json
index f9f5c5c..6a22a9f 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@turf/turf": "^5.1.6",
     "axios": "^0.19.2",
     "color": "^3.1.2",
     "csv-parse": "^4.8.3",
diff --git a/src/tam/simulation.js b/src/tam/simulation.js
index 8ed06f3..22767d8 100644
--- a/src/tam/simulation.js
+++ b/src/tam/simulation.js
@@ -1,4 +1,5 @@
 const axios = require('axios');
+const turf = require('@turf/turf');
 const network = require('./network.json');
 
 const server = 'http://localhost:4321';
@@ -189,38 +190,46 @@ const updatePositions = (courses, time) =>
                 const previousNode = segment.points[nextNodeIndex - 1];
                 const nextNode = segment.points[nextNodeIndex];
 
+                const previousPoint = turf.toMercator([
+                    previousNode.lon,
+                    previousNode.lat
+                ]);
+
+                const nextPoint = turf.toMercator([
+                    nextNode.lon,
+                    nextNode.lat
+                ]);
+
                 const curLength = course.traveledDistance
                     - previousNode.distance;
                 const totalLength = nextNode.distance
                     - previousNode.distance;
-                const progression = curLength / totalLength;
+                const t = curLength / totalLength;
 
-                course.position = {
-                    lat: progression * nextNode.lat
-                        + (1 - progression) * previousNode.lat,
-                    lon: progression * nextNode.lon
-                        + (1 - progression) * previousNode.lon,
-                };
+                course.position = [
+                    t * nextPoint[0] + (1 - t) * previousPoint[0],
+                    t * nextPoint[1] + (1 - t) * previousPoint[1],
+                ];
             }
         }
         else
         {
-            const currentStop = network.stops[course.currentStop];
-            course.position = {
-                lat: currentStop.lat,
-                lon: currentStop.lon,
-            };
+            const currentNode = network.stops[course.currentStop];
+            course.position = turf.toMercator([
+                currentNode.lon,
+                currentNode.lat
+            ]);
         }
     }
 };
 
-const run = callback =>
+const start = () =>
 {
     const courses = {};
     let lastFrame = null;
     let lastUpdate = null;
 
-    const loop = () =>
+    const update = () =>
     {
         const now = Date.now();
 
@@ -233,12 +242,9 @@ const run = callback =>
         const time = lastFrame === null ? 0 : now - lastFrame;
         lastFrame = now;
         updatePositions(courses, time);
-
-        callback(courses);
     };
 
-    const interval = setInterval(loop, 24);
-    return () => clearInterval(interval);
+    return {courses, update};
 };
 
-exports.run = run;
+exports.start = start;