diff --git a/components/map/Course.tsx b/components/map/Course.tsx
index 9a327e6..8f1f823 100644
--- a/components/map/Course.tsx
+++ b/components/map/Course.tsx
@@ -1,37 +1,16 @@
-import { useEffect, useState } from 'react';
+import { useEffect, useMemo, useState } from 'react';
 import { Polyline } from 'react-leaflet';
+import {CourseData} from '../../lib/gpx_parser';
 
-const mintrackpointdelta = 0.0001;
-
-export default function MapCourse({ map, course }) {
-	const { trackpoints } = course?.tracks[0]?.segments[0] || [];
-	const [polyline, setPolyline] = useState([]);
+export default function MapCourse({ map, course }: {map: any, course: CourseData}) {
+	const { trackpoints } = course?.tracks[0]?.segments[0] || {trackpoints: []};
+	const polyline = useMemo(() => trackpoints.map(({lat, lon}) => [lat, lon]), [trackpoints]);
 
 	useEffect(() => {
-		const pointArray = [];
-
-		if (trackpoints.length > 0) {
-			let lastlon = parseFloat(trackpoints[0].lon);
-			let lastlat = parseFloat(trackpoints[0].lat);
-
-			pointArray.push([lastlon, lastlat]);
-
-			for (let i = 1; i < trackpoints.length; i++) {
-				const lon = parseFloat(trackpoints[i].lon);
-				const lat = parseFloat(trackpoints[i].lat);
-
-				const latdiff = lat - lastlat;
-				const londiff = lon - lastlon;
-				if (Math.sqrt(latdiff * latdiff + londiff * londiff) > mintrackpointdelta) {
-					lastlon = lon;
-					lastlat = lat;
-					pointArray.push([lat, lon]);
-				}
-			}
+		if (map && polyline.length > 0) {
+			map.flyTo(polyline[0], map.getZoom());
 		}
-
-		setPolyline(pointArray);
-	}, [trackpoints]);
+	}, [,map, polyline]);
 
 	return <Polyline pathOptions={{ color: 'black' }} positions={polyline} />;
 }
diff --git a/components/map/Marker.tsx b/components/map/Marker.tsx
index 2273342..341ceec 100644
--- a/components/map/Marker.tsx
+++ b/components/map/Marker.tsx
@@ -8,7 +8,6 @@ import MarkerShadow from '../../node_modules/leaflet/dist/images/marker-shadow.p
 export default function MapMarker({ map, position }) {
 	useEffect(() => {
 		if (map) {
-			console.log('fly to ', position);
 			map.flyTo(position, map.getZoom());
 		}
 	}, [map, position]);
diff --git a/lib/gpx_parser.ts b/lib/gpx_parser.ts
index e892b75..0243e54 100644
--- a/lib/gpx_parser.ts
+++ b/lib/gpx_parser.ts
@@ -1,3 +1,25 @@
+type Coord = {
+	lat: number;
+	lon: number;
+};
+type Trackpoint = Coord & {
+	ele: number;
+};
+type Segment = {
+	trackpoints: Trackpoint[];
+};
+type Track = {
+	name?: string;
+	segments: Segment[];
+}
+type Routepoint = Coord;
+type Waypoint = Coord;
+export type CourseData = {
+	tracks: Track[];
+	routePoints: Routepoint[],
+	waypoints: Waypoint[];
+};
+
 export async function parseGpxFile2Document(file: File): Promise<Document> {
 	return new Promise((resolve, reject) => {
 		const reader = new FileReader();
@@ -15,7 +37,7 @@ export async function parseGpxFile2Document(file: File): Promise<Document> {
 	});
 }
 
-function* elIter(el: HTMLCollectionOf<Element>, callback: (el: Element) => any) {
+function* elIter<T>(el: HTMLCollectionOf<Element>, callback: (el: Element) => T) {
 	for (let i = 0; i < el.length; i++) {
 		yield callback(el[i]);
 	}
@@ -25,17 +47,17 @@ function getElValue(el: HTMLCollectionOf<Element>) {
 	return el[0].childNodes[0].nodeValue;
 }
 
-function parseTrackpoints(trackpoints: HTMLCollectionOf<Element>) {
+function parseTrackpoints(trackpoints: HTMLCollectionOf<Element>): Trackpoint[] {
 	return [
-		...elIter(trackpoints, (trackpoint) => ({
-			lon: parseFloat(trackpoint.getAttribute('lon')),
+		...elIter<Trackpoint>(trackpoints, (trackpoint) => ({
 			lat: parseFloat(trackpoint.getAttribute('lat')),
-			ele: getElValue(trackpoint.getElementsByTagName('ele')),
+			lon: parseFloat(trackpoint.getAttribute('lon')),
+			ele: parseFloat(getElValue(trackpoint.getElementsByTagName('ele'))),
 		})),
 	];
 }
 
-function parseSegments(segments: HTMLCollectionOf<Element>) {
+function parseSegments(segments: HTMLCollectionOf<Element>): Segment[] {
 	return [
 		...elIter(segments, (segment) => ({
 			trackpoints: parseTrackpoints(segment.getElementsByTagName('trkpt')),
@@ -43,15 +65,32 @@ function parseSegments(segments: HTMLCollectionOf<Element>) {
 	];
 }
 
-function parseTracks(tracks: HTMLCollectionOf<Element>) {
+function parseTracks(tracks: HTMLCollectionOf<Element>): Track[] {
 	return [
-		...elIter(tracks, (track) => ({
+		...elIter<Track>(tracks, (track) => ({
 			name: getElValue(track.getElementsByTagName('name')),
 			segments: parseSegments(track.getElementsByTagName('trkseg')),
 		})),
 	];
 }
 
-export function gpxDocument2obj(doc: Document) {
-	return { tracks: parseTracks(doc.documentElement.getElementsByTagName('trk')) };
+export function gpxDocument2obj(doc: Document): CourseData {
+	return {
+		tracks: parseTracks(doc.documentElement.getElementsByTagName('trk')),
+		routePoints: [],
+		waypoints: [],
+	};
+}
+
+export function getMapBounds(obj: CourseData) {
+	// TODO support all tracks and segments
+	const points = [...obj.tracks[0].segments[0].trackpoints, ...obj.routePoints, ...obj.waypoints];
+	const lats = points.map(({lat}) => lat);
+	const lons = points.map(({lon}) => lon);
+	return {
+		minlat: Math.min(...lats),
+		maxlat: Math.max(...lats),
+		minlon: Math.min(...lons),
+		maxlon: Math.max(...lons),
+	};
 }
diff --git a/pages/ride/map/index.tsx b/pages/ride/map/index.tsx
index 6af4550..5f0e2a8 100644
--- a/pages/ride/map/index.tsx
+++ b/pages/ride/map/index.tsx
@@ -4,14 +4,14 @@ import Container from '@mui/material/Container';
 import Grid from '@mui/material/Grid';
 import Stack from '@mui/material/Stack';
 import Button from '@mui/material/Button';
-import { useState } from 'react';
+import { useEffect, useMemo, useState } from 'react';
 import MyHead from '../../../components/MyHead';
 import Title from '../../../components/Title';
 import OpenStreetMap from '../../../components/map/OpenStreetMap';
 import MapMarker from '../../../components/map/Marker';
 import Course from '../../../components/map/Course';
 import ImportFileButton from '../../../components/ImportFileButton';
-import { gpxDocument2obj, parseGpxFile2Document } from '../../../lib/gpx_parser';
+import { CourseData, getMapBounds, gpxDocument2obj, parseGpxFile2Document } from '../../../lib/gpx_parser';
 
 type OpenStreetMapArg = Parameters<typeof OpenStreetMap>[0];
 type MapMarkerArg = Parameters<typeof MapMarker>[0];
@@ -45,11 +45,10 @@ function MyLocationButton({ setPosition }) {
 	);
 }
 
-function Courses({ map, courses }) {
+function Courses({ map, courses }: { map: any, courses: CourseData[] }) {
 	return (
 		<>
-			{courses.map((course, i: number) => {
-				return <DynamicCourse key={i} map={map} course={course} />;
+			{courses.map((course: CourseData, i: number) => {
 			})}
 		</>
 	);
@@ -58,12 +57,19 @@ function Courses({ map, courses }) {
 export default function RideMap() {
 	const [map, setMap] = useState(null);
 	const [coord, setCoord] = useState([51.505, -0.09]);
-	const [courses, setCourses] = useState([]); // TODO reducer?
+	const [course, setCourse] = useState<CourseData>();
+	const bounds = useMemo(() => course && getMapBounds(course), [course]);
+
+	useEffect(() => {
+		if (bounds) {
+			map.fitBounds([[bounds.minlat, bounds.minlon], [bounds.maxlat, bounds.maxlon]]);
+		}
+	}, [bounds]);
 
 	const importGpx = (file: File) => {
 		parseGpxFile2Document(file)
 			.then((xmlDoc: Document) => {
-				setCourses([...courses, gpxDocument2obj(xmlDoc)]);
+				setCourse(gpxDocument2obj(xmlDoc));
 			})
 			.catch((err) => {
 				console.error('Would be nice to show this:', err);
@@ -90,7 +96,7 @@ export default function RideMap() {
 
 				<DynamicMap center={coord} setMap={setMap}>
 					<DynamicMapMarker map={map} position={coord} />
-					<Courses map={map} courses={courses} />
+					{ course ? <DynamicCourse map={map} course={course} /> : <></> }
 				</DynamicMap>
 
 				<Grid container direction="row" alignItems="center" spacing={2}></Grid>