That was the issue. Thanks everyone for all the help; this product’s got a bit of a learning curve. :-)

That didn’t quite work, neither:

Needs["DatabaseLink`"]; conn = OpenSQLConnection["Dash"]; data = 
 SQLExecute[conn, 
  "SELECT latitude, longitude, altitude FROM points WHERE \
DATETIME(time/1000,'unixepoch','localtime') >= DATETIME('now','start \
of day','-1 days') AND DATETIME(time/1000,'unixepoch','localtime') < \
DATETIME('now','start of day') ORDER BY time"]; img = 
 GeoGraphics[Map[GeoCircle[Take[#, 2], Quantity[#[[-1]], "m"]]] &, 
  data]; myFileName = 
 "/Volumes/4TB External/Databases/Maps/" <> 
  Riffle[ToString /@ PreviousDate["Day"][[1]][[;; 3]], "-"] <> 
  "_circles.png";
Export[myFileName, img]

This is an example of what I started with; I wanted to create a new script that instead of the line would show the points with the accompanying margin of error. Most resulting maps would be zoomed enough to see large differences in the accuracy (the long excursion up to Atlanta and back was evacuating from Hurricane Irma in 2017).

Needs["DatabaseLink`"]; conn = OpenSQLConnection["Dash"]; data = 
 SQLExecute[conn, 
  "SELECT latitude, longitude FROM points ORDER BY time"]; img = 
 GeoGraphics[{Blue, Thick, Line@GeoPosition@data}, 
  GeoScaleBar -> "Imperial", ImageSize -> Full, 
  GeoBackground -> GeoStyling["StreetMap"]]; myFileName = 
 "/Volumes/4TB External/Databases/Maps/" <> 
  Riffle[ToString /@ PreviousDate["Day"][[1]][[;; 3]], "-"] <> 
  ".png";
Export["/Volumes/4TB External/Databases/Maps/alltrips.png", img]

The output from the query looks like this (showing just the first part because it’s 57,000 points in the database and growing); basically triplets/vectors of {latitude, longitude, accuracy in meters}:

{{27.9842, -82.5698, 2.55041}, {27.9847, -82.5702, 4.30254}, {27.9847, -82.5702, 4.30254}, {27.9847, -82.5702, 4.30254}, … }

I’m pulling this data from a database (latitude, longitude, accuracy), so how would it format for that? I’ve got GeoCircle @@@ data, but is there a way to select a specific field in data so I could structure it like GeoCircle [{{data.latitude, data.longitude}, Quantity[data.accuracy,”m”]}?