https://sealevel.example.com/ Every post on this site, newest first: the 70-meter scenario, how elevation is measured, glaciers, coasts and the app itself. en-us Wed, 02 Sep 2026 00:00:00 GMT https://sealevel.example.com/blog/no-account-no-ads-no-analytics/ https://sealevel.example.com/blog/no-account-no-ads-no-analytics/ Three absences, stated and designed in: nothing to sign up for, nothing to display, nothing to track. What the app stores, what it sends, and why the privacy is fixed by design instead of by settings. Wed, 02 Sep 2026 00:00:00 GMT The App Randolph Tavenner https://sealevel.example.com/blog/meters-versus-feet/ https://sealevel.example.com/blog/meters-versus-feet/ The global model behind the 70-meter map is computed in meters, most of the world reads them in meters, and the parts that do not still expect feet. How the switch works, and why it never changes the calculation. Wed, 26 Aug 2026 00:00:00 GMT Elevation Randolph Tavenner https://sealevel.example.com/blog/warnings-that-run-in-two-hours/ https://sealevel.example.com/blog/warnings-that-run-in-two-hours/ The optional elevation-warning feature does background work only while you are near a risky elevation, in sessions that shut themselves down. How the 2-hour sessions are designed, and what happens to the battery. Wed, 19 Aug 2026 00:00:00 GMT The App Randolph Tavenner https://sealevel.example.com/blog/the-70-meter-map-explained/ https://sealevel.example.com/blog/the-70-meter-map-explained/ What the full-melt scenario is, how the number is estimated, and what the map does and does not predict. The assumptions behind Sea Level's headline number, stated plainly. Wed, 12 Aug 2026 00:00:00 GMT Sea Level Rise Randolph Tavenner https://sealevel.example.com/blog/how-the-app-finds-your-elevation/ https://sealevel.example.com/blog/how-the-app-finds-your-elevation/ Sea Level does not guess: it combines GPS, a barometer when the phone has one, and public elevation data as the fallback. How the three sources work, how they rank, and where the meters come from. Wed, 05 Aug 2026 00:00:00 GMT Elevation Randolph Tavenner