Altitude accuracy reach rs

I am just really starting with Reach RS, using one as a base station and one as a rover I seem to get excellent results for lat and long. However when I compare the altitude on sites like my altitude seems to be around 6-7 meters out. How accurate are these sites or does anyone have any tips on improving accuracy for Altitude?

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I think it’s important to note that Reach outputs height relative to ellipsoid while you might be comparing it to something else. The difference you mention looks very similar to a difference between geoid and ellipsoid heights.

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