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Re: Definition of terms requested.

From: Gary E. Miller
Subject: Re: Definition of terms requested.
Date: Sun, 28 Nov 2021 11:58:31 -0800

Yo David!

On Sun, 28 Nov 2021 11:55:04 +0000
David Taylor <> wrote:

> Many thanks for that, Gary.  Given that it's the receiver that
> delivers those values directly tells me where to look.

This is a good place to start:


> Elevation mask is something that I've never attempted to change from
> the default.

The -u-blox firmware sat selection algorithm seems to work well.  The
elevation mask is most useful for airborne applications, or in strong
multipath areas.

Then there are a lot of other knobs to play with as well.  Many find
hat turning off GLONASS helps.  Etc.

> Ntpviz is something else I've never used, so thanks for
> the pointer.

Here is a live sample from my pool server:

> A better location usually means a faster lock, more satellites
> visible, better reception of marginal satellites, and hence the
> expectation of an SNR increase!

Spend some time with gpsprof and you can see how those blend together.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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