https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1615425#M62636 <P>I linked a map to use for offline instances, and see this error:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="dwold_0-1747401078269.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/132400iAB1AAF852EB72F83/image-size/medium?v=v2&amp;px=400" role="button" title="dwold_0-1747401078269.png" alt="dwold_0-1747401078269.png" /></span></P><P>Some documents say to make sure the map is in&nbsp;WGS 1984 Web Mercator (auxiliary sphere), which this is.&nbsp;</P><P>Anyone else come across this?</P> Fri, 16 May 2025 13:13:19 GMT dwold 2025-05-16T13:13:19Z https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1615425#M62636 <P>I linked a map to use for offline instances, and see this error:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="dwold_0-1747401078269.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/132400iAB1AAF852EB72F83/image-size/medium?v=v2&amp;px=400" role="button" title="dwold_0-1747401078269.png" alt="dwold_0-1747401078269.png" /></span></P><P>Some documents say to make sure the map is in&nbsp;WGS 1984 Web Mercator (auxiliary sphere), which this is.&nbsp;</P><P>Anyone else come across this?</P> Fri, 16 May 2025 13:13:19 GMT https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1615425#M62636 dwold 2025-05-16T13:13:19Z https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1615636#M62651 <P><A href="https://en.wikipedia.org/wiki/EPSG_Geodetic_Parameter_Dataset" target="_blank">EPSG Geodetic Parameter Dataset - Wikipedia</A></P><P><SPAN>EPSG:4326 is a datum for the geographic coordinate system</SPAN></P><P><SPAN>EPSG:3857 is the web mercator projection of 4326 data</SPAN></P> Fri, 16 May 2025 19:18:23 GMT https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1615636#M62651 DanPatterson 2025-05-16T19:18:23Z https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1616020#M62673 <P>Hi&nbsp;<a href="https://community.esri.com/t5/user/viewprofilepage/user-id/669948">@dwold</a>,</P><P>Adding to what Dan said above, please consult the online documentation:</P><P><A href="https://doc.arcgis.com/en/survey123/desktop/create-surveys/preparebasemaps.htm#:~:text=Survey123%20supports%20the%20use%20of%20offline%20basemaps.%20These%20basemaps%20must%20be%20of%20a%20supported%20Esri%20file%20type%20and%20use%20the%20Web%20Mercator%20Auxiliary%20Sphere%20projection" target="_blank">https://doc.arcgis.com/en/survey123/desktop/create-surveys/preparebasemaps.htm#:~:text=Survey123%20supports%20the%20use%20of%20offline%20basemaps.%20These%20basemaps%20must%20be%20of%20a%20supported%20Esri%20file%20type%20and%20use%20the%20Web%20Mercator%20Auxiliary%20Sphere%20projection</A></P><P>If you are using any type of packages, check that the data is in the same Web Mercator Auxiliary Sphere projection</P><P>Regards,</P><P>Glen</P> Mon, 19 May 2025 14:19:40 GMT https://community.esri.com/t5/arcgis-survey123-questions/offline-map-unsupported-spatial-reference-4326/m-p/1616020#M62673 GlenterpriseUK 2025-05-19T14:19:40Z