My friend is training for the Grand Traverse and using the Munter method in his pacing estimates.

Last weekend I hacked together a Strava app that calculates Munter rates from your activity data.

Connect your Strava account, and whenever you upload a "Backcountry Ski" activity, it'll put the rates at the bottom of the activity description.

Made a "Club" on Strava for feedback/suggestions/feature requests/etc: https://www.strava.com/clubs/1106227/discussion

Cheers!