In the course of trying to find what
geoid model Garmin uses, I found this on a
Garmin support page:
On 4/20/2021 8:23 PM, Nicolas Cadieux wrote:
. It is not uncommon for satellite heights to be off from map elevations by +/- 400 ft. Use these values with caution when navigating.Apparently some, but not all, models of the Garmin64 have a barometric altimeter. Depending on your actual model, this may or may not apply.
On 4/20/2021 8:23 PM, Nicolas Cadieux wrote:
Hi,David gave you a very good answer. Your looking at a 11 meter difference. That is not much. The first thing would be to look at the gps measurement. (Any trees? Good satellite constellation? Any obstacles?). At best, your looking at a 6 to 10 meter error vertically. SRTMs are affected by trees. That would make the SRTM higher (not your case). Last thing to look at the the differences between the gps geiod model (a model of the average sea level). SRTM use EGM96. Your GPS probably uses something a bit more modern. You can easily get a 5 meter error between two Geiods.
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