Hello Nils - There can be small elevation differences between surveyed elevations and elevations interpolated from DEM data, and different maps produced at different times can produce different elevation numbers, but these differences don't generally reflect a change in the peak's actual height. As you know, Mt. Katmai significantly changed shape as a result of the 1912 Katmai-Novarupta eruption, but the current elevation reflects the post-1912 summit height. The flight simulator might not be doing a good job of rendering apparent elevations. The good folks over at The National Map are responsible for our country's elevation data: https://www.usgs.gov/core-science-systems/national-geospatial-program/nation... , and you can ask them about these peaks. Thank you, Cheryl Cameron -------- Nils Monsen wrote: I am from Alaska, raised in the Naknek / King salmon, a 60 mile Westerly distance from the infamous Katmai crater. Upon returning after 30 years I began noticing the visible peaks of the nearby Mountains. I also fly these areas via Flight simulation and found some visual contradictions which may be my own misunderstanding yet each time I correlate the data I come to the same problems which may simply be my visual error. So, here is the question. With regard to which is the higher peak in the vicinity of Katmai. Knife Peak, slightly North of Katmai is listed at 7700 feet while Mt Katmai is listed at 6715 feet. On the southern side is Mt Mageik listed at 7150. The visual perception suggests Katmai is the highest. I have gone back several times and reexamined the eyeshot vs the suggested heights and cannot reconcile this problem, and am left with the notion that I am missing something fundamental or the data is not correct, or the heights have changed over time. If my observations are correct, these peaks heights should to be reexamined. If I am wrong, I hope you have the tools to test this theory and explain the error. Sincerely, Nils Monsen Akomni45@gmail.com 907-242-7015 -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050