On Wed, Feb 21, 2018 at 06:41:42PM -0800, shadow at shadowgard.com (via tml list) wrote:
> That leaves the CG & propulsion. What Piper called "lift & drive".
> They are probably detectable to some extent with grav sensors of
> some sort.
>
> Question is, how detectable and at what range.

GURPS Traveller has rules for various levels of grav sensors and their
detection rules.  Those could be a reasonable guideline from a source
that was at least once canonical.  I don't have the books with me, but
I'm pretty sure that getting a fairly precise fix was fairly easy
after the initial detection.

There are also stealth options though, which for someone rich and
averse to being tracked, would make sense.

- Tim