I am looking for a way to get accurate measurements on webmap hosted on AGOL using AGOL basemap (Web Mercator). Is there a way to set the projection of the webmap to UTM without using a custom basemap? Or is there a way to modify the existing measurement and draw widgets to measure in a custom projection (i.e. measure in UTM10 off a webmap in Web Mercator)?
ESRI Canada did direct me to JS samples:
I have no JS dev experience, so before I dive head first into this I'd like to see what other people are doing. Surely I can't be the only on in this boat, Web Mercator seems utterly pointless for measuring when the discrepancies are so high, as illustrated in the sample page below: