It took me fifteen years to finally make it to Hawaii for work. Like most old timers, I recall the “old days” and lament the changes. Especially the a...

FWIW. Living in a newly developed area there aren’t any NGS points with horizontal control nearby. I have not searched for any to test the watch. Tha...

Oh no! This event is on Thursday. That’s tomorrow. Such an interesting topic…

I speculate that the CGVD28(HT2.0) takes GNSS-derived ellipsoid heights applies a gravimetric geoid model then another model to account for the differ...

Do you use GPS-only or multi-constellation? I see no GNSS solution to dense canopy. Years ago there were some hydraulic towers used in Scandinavia. Ob...

@bill93 , et al…

FWIW, the service web page is: Included on this site is the following: I would work through link in the image above. HTH, DMM

@oldpacer Evidently you did not carefully read the article. It does not discuss using one SV for positioning. It does, in the context of analyzing t...

As autonomous positioning relies on the broadcast ephemeris, users interested in its accuracy might want to view this article:

I did not realize this was an old post. There are broken links embedded in some replies. For the Helmert transformation parameters used by the US NGS...

@oldpacer FWIW, any visit to Australia should include visits to the Gondwana Rainforests. Lovely, lush, verdant with abundant wildlife.

First of all, I am no expert on magnetic variation nor bearings. I am also familiar with the form and the source of its contents. I do see that the C...

Output in CSV format shown below. Registration is not required to run the tool. The registration request is an attempt to justify their support for th...

This addresses the changes between dates. Note the highlighted section. Note as well that access requires registration.