diff --git a/package-lock.json b/package-lock.json
index 31a3a3f..5442be3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "www-epivis",
-  "version": "2.1.9",
+  "version": "2.1.10",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "www-epivis",
-      "version": "2.1.9",
+      "version": "2.1.10",
       "license": "MIT",
       "dependencies": {
         "uikit": "^3.15.5"
diff --git a/package.json b/package.json
index 078028c..08fb140 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "www-epivis",
-  "version": "2.1.9",
+  "version": "2.1.10",
   "private": true,
   "license": "MIT",
   "description": "",
diff --git a/src/components/dialogs/ImportAPIDialog.svelte b/src/components/dialogs/ImportAPIDialog.svelte
index c8dae50..e15838f 100644
--- a/src/components/dialogs/ImportAPIDialog.svelte
+++ b/src/components/dialogs/ImportAPIDialog.svelte
@@ -74,8 +74,12 @@
             bind:group={$formSelections.dataSource}
             value="covidcast"
           />
-          Delphi Indicators (aka COVIDcast) (source:
-          <a target="_blank" href="https://delphi.cmu.edu/">delphi.cmu.edu</a>)</label
+          Delphi Indicators (aka COVIDcast) (docs:
+          <a
+            target="_blank"
+            href="https://cmu-delphi.github.io/delphi-epidata/api/covidcast_signals.html#all-available-sources-and-signals"
+            >cmu-delphi.github.io</a
+          >)</label
         >
         <label
           ><input
diff --git a/src/deriveLinkDefaults.ts b/src/deriveLinkDefaults.ts
index aff7e3e..5256152 100644
--- a/src/deriveLinkDefaults.ts
+++ b/src/deriveLinkDefaults.ts
@@ -14,6 +14,7 @@ import {
   importTwitter,
   importWiki,
 } from './api/EpiData';
+import { NavMode } from './components/chartUtils';
 import DataSet, { DataGroup, DEFAULT_GROUP, flatten, DEFAULT_VIEWPORT } from './data/DataSet';
 import EpiDate from './data/EpiDate';
 import EpiPoint from './data/EpiPoint';
@@ -35,6 +36,7 @@ export interface SharedState {
   active: DataSet[];
   viewport: null | [number, number, number, number];
   showPoints: boolean;
+  navMode: NavMode;
 }
 
 const DEFAULT_VALUES: SharedState = {
@@ -42,6 +44,7 @@ const DEFAULT_VALUES: SharedState = {
   active: [],
   viewport: DEFAULT_VIEWPORT,
   showPoints: false,
+  navMode: NavMode.pan,
 };
 
 const lookups = {
@@ -202,6 +205,8 @@ export default function deriveLinkDefaults(): SharedState & { loader?: ReturnTyp
       active: [],
       showPoints: parsed.chart?.showPoints ?? DEFAULT_VALUES.showPoints,
       viewport: parsed.chart?.viewport ?? DEFAULT_VALUES.viewport,
+      // if we were not passed viewport coords, set to autofit mode
+      navMode: parsed.chart?.viewport ? DEFAULT_VALUES.navMode : NavMode.autofit,
       loader: initialLoader(parsed.datasets),
     };
   } catch (err) {
@@ -214,7 +219,8 @@ export default function deriveLinkDefaults(): SharedState & { loader?: ReturnTyp
 export function getDirectLinkImpl(state: SharedState): { url: URL; anySkipped: boolean } {
   const config: ILinkConfig = {
     chart: {
-      viewport: state.viewport ?? [0, 0, 0, 0],
+      // if in autofit mode, pass null viewport, else preserve viewport (or default to 0s)
+      viewport: state.navMode == NavMode.autofit ? null : state.viewport ?? [0, 0, 0, 0],
       showPoints: state.showPoints,
     },
     datasets: [],
diff --git a/src/store.ts b/src/store.ts
index dbb4be2..3a92b70 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -1,5 +1,4 @@
 import { get, writable } from 'svelte/store';
-import { NavMode } from './components/chartUtils';
 import DataSet, { DataGroup } from './data/DataSet';
 import deriveLinkDefaults, { getDirectLinkImpl } from './deriveLinkDefaults';
 import FormSelections from './components/dialogs/formSelections';
@@ -16,7 +15,7 @@ export const expandedDataGroups = writable([defaults.group]);
 
 export const isShowingPoints = writable(defaults.showPoints);
 export const initialViewport = writable(defaults.viewport);
-export const navMode = writable(NavMode.autofit);
+export const navMode = writable(defaults.navMode);
 
 export function getFormSelections() {
   try {
@@ -97,6 +96,7 @@ export function getDirectLink(chart: IChart): { url: URL; anySkipped: boolean }
     active: get(activeDatasets),
     showPoints: get(isShowingPoints),
     viewport: chart.getViewport(),
+    navMode: get(navMode),
   });
 }