diff --git a/src/CanExplorer.js b/src/CanExplorer.js
index 5893ba9..2a7ac40 100644
--- a/src/CanExplorer.js
+++ b/src/CanExplorer.js
@@ -146,7 +146,7 @@ export default class CanExplorer extends Component {
         prevMsgEntries = {};
       }
 
-      const {dbc, dbcFilename, route, firstCanTime} = this.state;
+      const {dbc, dbcFilename, route, firstCanTime, canFrameOffset} = this.state;
       var worker = new CanFetcher();
 
       worker.onmessage = (e) => {
@@ -196,7 +196,7 @@ export default class CanExplorer extends Component {
       worker.postMessage({dbcText: dbc.text(),
                           base: route.url,
                           num: part,
-                          canStartTime: firstCanTime,
+                          canStartTime: firstCanTime - canFrameOffset,
                           prevMsgEntries
                         });
     }
diff --git a/src/api/routes.js b/src/api/routes.js
index 781a133..595e183 100644
--- a/src/api/routes.js
+++ b/src/api/routes.js
@@ -47,7 +47,29 @@ const DEMO_ROUTES = {
       "start_lng": -122.465,
       "start_time": "2017-06-30T17:37:49",
       "url": "https://chffrprivate.blob.core.windows.net/chffrprivate3/v2/b67ff0c1d78774da/c130d5eaf04518c4d08ede29efbd519b_2017-06-30--17-37-49"
-  }
+  },
+  "2017-07-10--19-11-08": { // elikorh panda route with bad offset
+      "can": true,
+      "device_type": 2,
+      "end_geocode": "Fargo",
+      "end_lat": 46.9041,
+      "end_lng": -96.8059,
+      "end_time": "2017-07-10T19:19:34",
+      "fullname": "03ad84b839400fdb|2017-07-10--19-11-08",
+      "len": 5.4562,
+      "maxcamera": 8,
+      "maxlog": 8,
+      "movie": true,
+      "piececount": 8,
+      "proccamera": 8,
+      "proclog": 8,
+      "sig_path": "03ad84b839400fdb/29176323acf8f30b6a09c188d8a3edb9_2017-07-10--19-11-08",
+      "start_geocode": "Fargo",
+      "start_lat": 46.8565,
+      "start_lng": -96.8426,
+      "start_time": "2017-07-10T19:11:08",
+      "url": "https://chffrprivate.blob.core.windows.net/chffrprivate3/v2/03ad84b839400fdb/29176323acf8f30b6a09c188d8a3edb9_2017-07-10--19-11-08"
+    }
 };
 
 function getCommaAccessToken() {
diff --git a/src/components/HLS.js b/src/components/HLS.js
index b600155..b39075a 100644
--- a/src/components/HLS.js
+++ b/src/components/HLS.js
@@ -44,8 +44,7 @@ export default class HLS extends Component {
     this.videoElement.addEventListener('seeking', () => {
       if(!this.props.playing) {
         this.props.onLoadStart();
-        const progress = this.props.segmentProgress(this.videoElement.currentTime);
-        this.props.onPlaySeek(progress);
+        this.props.onPlaySeek(this.videoElement.currentTime);
       }
     });
     let shouldInitVideoTime = true;
diff --git a/src/components/RouteSeeker.js b/src/components/RouteSeeker.js
index b9594a0..a74ec55 100644
--- a/src/components/RouteSeeker.js
+++ b/src/components/RouteSeeker.js
@@ -156,7 +156,7 @@ export default class RouteSeeker extends Component {
 
             if(newRatio >= 0) {
                 this.updateSeekedBar(newRatio);
-                this.props.onPlaySeek(newRatio);
+                this.props.onPlaySeek(currentTime);
             }
         }, 30);
         let {ratio} = this.state;
diff --git a/src/components/RouteVideoSync.js b/src/components/RouteVideoSync.js
index c810ad8..a80266d 100644
--- a/src/components/RouteVideoSync.js
+++ b/src/components/RouteVideoSync.js
@@ -22,7 +22,7 @@ export default class RouteVideoSync extends Component {
         onUserSeek: PropTypes.func.isRequired,
         onPlay: PropTypes.func.isRequired,
         onPause: PropTypes.func.isRequired,
-        userSeekRatio: PropTypes.number.isRequired
+        userSeekTime: PropTypes.number.isRequired
     };
 
     constructor(props) {
@@ -53,17 +53,9 @@ export default class RouteVideoSync extends Component {
         }
     }
 
-    nearestFrameTime() {
-        const {userSeekTime, message, canFrameOffset, firstCanTime} = this.props;
-        if(!message) {
-            return this.ratioTime(this.props.userSeekRatio);
-        }
-        return canFrameOffset + this.props.userSeekTime;
-    }
-
     nearestFrameUrl() {
         const {url} = this.props;
-        const sec = Math.round(this.nearestFrameTime());
+        const sec = Math.round(this.props.userSeekTime);
         return cameraPath(url, sec);
     }
 
@@ -107,7 +99,7 @@ export default class RouteVideoSync extends Component {
     onUserSeek(ratio) {
         /* ratio in [0,1] */
 
-        const funcSeekToRatio = () => this.props.onUserSeek(ratio);
+        const funcSeekToRatio = () => this.props.onUserSeek(this.ratioTime(ratio));
         if(ratio == 0) {
             this.setState({shouldRestartHls: true},
                           funcSeekToRatio);
@@ -130,7 +122,7 @@ export default class RouteVideoSync extends Component {
                     <HLS
                          className={css(Styles.hls)}
                          source={Video.videoUrlForRouteUrl(this.props.url)}
-                         startTime={this.nearestFrameTime()}
+                         startTime={this.props.userSeekTime}
                          playbackSpeed={1}
                          onVideoElementAvailable={this.onVideoElementAvailable}
                          playing={this.props.playing}
@@ -144,7 +136,7 @@ export default class RouteVideoSync extends Component {
                          onRestart={this.onHlsRestart} />
                      <RouteSeeker
                          className={css(Styles.seekBar)}
-                         nearestFrameTime={this.nearestFrameTime()}
+                         nearestFrameTime={this.props.userSeekTime}
                          segmentProgress={this.segmentProgress}
                          secondsLoaded={this.props.secondsLoaded}
                          segmentIndices={this.props.segmentIndices}
diff --git a/src/components/explorer.js b/src/components/explorer.js
index d6dce97..f254875 100644
--- a/src/components/explorer.js
+++ b/src/components/explorer.js
@@ -41,9 +41,8 @@ export default class Explorer extends Component {
             segmentIndices: [],
             shouldShowAddSignal: true,
             userSeekIndex: 0,
-            userSeekRatio: 0,
-            userSeekTime: 0,
-            playing: this.props.autoplay,
+            userSeekTime: props.currentParts[0] * 60,
+            playing: props.autoplay,
             signals: {}
         };
         this.onSignalPlotPressed = this.onSignalPlotPressed.bind(this);
@@ -185,13 +184,10 @@ export default class Explorer extends Component {
             }
         }
 
-        if(nextProps.partsLoaded !== this.props.partsLoaded && !nextMessage) {
-            let userSeekRatio = this.state.userSeekRatio;
-            const nextSecondsLoaded = this.secondsLoadedRouteRelative(nextProps.currentParts);
-            userSeekRatio = (userSeekRatio * this.secondsLoaded()) / nextSecondsLoaded;
-
-
-            this.setState({userSeekRatio});
+        if(JSON.stringify(nextProps.currentParts) !== JSON.stringify(this.props.currentParts)) {
+            const {userSeekTime} = this.state;
+            const nextSeekTime = (userSeekTime - this.props.currentParts[0] * 60) + nextProps.currentParts[0] * 60;
+            this.setState({userSeekTime: nextSeekTime});
         }
     }
 
@@ -251,42 +247,50 @@ export default class Explorer extends Component {
     }
 
     resetSegment() {
-        this.setState({segment: [], segmentIndices: [], userSeekIndex: 0, userSeekTime: 0})
+        const {segment, segmentIndices} = this.state;
+        if(segment.length > 0 || segmentIndices.length > 0) {
+            this.setState({segment: [], segmentIndices: [], userSeekIndex: 0, userSeekTime: 0})
+        }
     }
 
     showAddSignal() {
         this.setState({shouldShowAddSignal: true})
     }
 
-    indexFromSeekRatio(ratio) {
+    indexFromSeekTime(time) {
         // returns index guaranteed to be in [0, entries.length - 1]
 
         const {entries} = this.props.messages[this.props.selectedMessage];
         const {segmentIndices} = this.state;
         let segmentLength, offset;
         if(segmentIndices.length === 2) {
-            offset = segmentIndices[0];
-            segmentLength = segmentIndices[1] - segmentIndices[0];
+            for(let i = segmentIndices[0]; i <= segmentIndices[1]; i++) {
+                if(entries[i].relTime >= time) {
+                    return i;
+                }
+            }
+            return segmentIndices[1];
         } else {
-            offset = 0;
-            segmentLength = entries.length;
+            for(let i = 0; i < entries.length; i++) {
+                if(entries[i].relTime >= time) {
+                    return i;
+                }
+            }
+            return entries.length - 1;
         }
-
-        return Math.min(entries.length - 1, offset + Math.round(ratio * (segmentLength - 1)));
     }
 
-    onUserSeek(ratio) {
-        this.setState({userSeekRatio: ratio});
+    onUserSeek(time) {
+        this.setState({userSeekTime: time});
         const message = this.props.messages[this.props.selectedMessage];
         if(!message) {
-            const seekTime = ratio * this.secondsLoaded() + this.startOffset();
-            this.props.onUserSeek(seekTime);
-            this.props.onSeek(0, ratio * this.secondsLoaded() + this.startOffset());
+            this.props.onUserSeek(time);
+            this.props.onSeek(0, time);
             return;
         }
 
         const {entries} = message;
-        const userSeekIndex = this.indexFromSeekRatio(ratio);
+        const userSeekIndex = this.indexFromSeekTime(time);
         const seekTime = entries[userSeekIndex].relTime;
 
         this.setState({userSeekIndex, userSeekTime: seekTime});
@@ -294,16 +298,16 @@ export default class Explorer extends Component {
         this.props.onSeek(userSeekIndex, seekTime);
     }
 
-    onPlaySeek(ratio) {
+    onPlaySeek(time) {
         const message = this.props.messages[this.props.selectedMessage];
         if(!message) {
-            this.props.onSeek(0, ratio * this.secondsLoaded() + this.startOffset());
+            this.props.onSeek(0, time);
             return;
         }
 
         const {entries} = message
 
-        const seekIndex = this.indexFromSeekRatio(ratio);
+        const seekIndex = this.indexFromSeekTime(time);
         const seekTime = entries[seekIndex].relTime;
 
         this.props.onSeek(seekIndex, seekTime);
@@ -320,7 +324,6 @@ export default class Explorer extends Component {
         this.props.onUserSeek(time);
 
         this.setState({userSeekIndex,
-                       userSeekRatio: (userSeekIndex) / entries.length,
                        userSeekTime: time});
     }
 
@@ -368,7 +371,7 @@ export default class Explorer extends Component {
             startTime = entries[0].relTime;
         }
 
-        return canFrameOffset + startTime;
+        return startTime;
     }
 
     onVideoClick() {
@@ -459,12 +462,11 @@ export default class Explorer extends Component {
                                                 onUserSeek={this.onUserSeek}
                                                 onPlay={this.onPlay}
                                                 onPause={this.onPause}
-                                                userSeekRatio={this.state.userSeekRatio}
                                                 userSeekTime={this.state.userSeekTime} />
 
                                 {this.state.segment.length > 0 ?
                                     <div className={css(CommonStyles.button, Styles.resetSegment)}
-                                         onClick={() => this.resetSegment()}>
+                                         onClick={() => {this.resetSegment()}}>
                                         <p>Reset Segment</p>
                                     </div>
                                     : null}
diff --git a/src/workers/can-offset-finder.worker.js b/src/workers/can-offset-finder.worker.js
index d3cb719..8510cef 100644
--- a/src/workers/can-offset-finder.worker.js
+++ b/src/workers/can-offset-finder.worker.js
@@ -9,7 +9,7 @@ function calcCanFrameOffset(firstCanPart, partCanTimes) {
   const firstPartLastCanTime = partCanTimes[partCanTimes.length - 1];
 
   return (60 * firstCanPart
-          - (60 - (firstPartLastCanTime - firstCanTime)));
+          + (60 - (firstPartLastCanTime - firstCanTime)));
 }
 
 async function fetchCanTimes(base, part) {