It's time for a NOAA Ocean Podcast "Science Moment," where we sample the best segments from our past full-length podcasts. In this episode, hear about an effort called GPS on Bench Marks. A bench mark is a term used to describe any permanent mark or disk that's either in the ground or attached to a large structure. This permanent mark has a known elevation or height which makes it valuable to NOAA. There are over 400,000 bench marks in the United States, and in the GPS on Bench Marks project, anyone can visit the bench mark of their choice, record field notes, take digital photos, and collect GPS observations or coordinates and then use online tools to send the information to NOAA.


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