How I created an API to correct GPS to Sea Level.

Paul Harwood
Runic Software
Published in
11 min readSep 27, 2022

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A simple solution to a complicated problem.

Photo by Cristina Gottardi on Unsplash

The Problem

GPS is wonderful!

But it has problems with altitude!

Very simply:

  • Vertical GPS measurements are just less accurate (because of geometry), and
  • We don’t know where the surface of the Earth is!

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Paul Harwood
Runic Software

Paul is a long time veteran of the tech industries — with 30 years in the trenches including stints with Nokia and Google as well as startups QR8 and trackbash.