marker3D.customFields['name']=droneList[keyValue.Key]["DroneName"];

public class SomeScript : MonoBehaviour
{
    private void Start()
    {
        OnlineMapsMarkerBase marker = GetComponent<OnlineMapsMarker3DInstance>().marker;
        gameObject.name = marker["name"] as string;

        // When you create a marker:
        // marker["name"] = "SOME NAME";
    }
}

P.S. To store custom data (in this case, the passed GameObject name), it's better to use customFields instead of label, because the label will cause the tooltip to be displayed on hover.

The problem is that when you use Vector2, X is longitude, Y is latitude.
Latitude cannot be -97, so just reverse the order of the values.

P.S. When the marker needs to be visible at any zoom, you can simply remove the range setting line.

So I added this script (using GPS coordinates that should mark the same location that I'm directly over), and set an altitude of 300 (not sure if that's meters, feet, etc).  But the result is that I end up with the marker at the corner of the map, and it doesn't move with the map when I move.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class placeMarker : MonoBehaviour
{
    /// <summary>
        /// Prefab of 3D marker
        /// </summary>
        public GameObject markerPrefab;

        private OnlineMapsMarker3D marker3D;

        /*private void OnGUI()
        {
            if (GUI.Button(new Rect(5, 5, 100, 20), "Move Left"))
            {
                // Change the marker coordinates.
                Vector2 mPos = marker3D.position;
                mPos.x += 0.1f;
                marker3D.position = mPos;
            }
        }*/

        private void Start()
        {
            // Get instance of OnlineMapsControlBase3D (Texture or Tileset)
            OnlineMapsControlBase3D control = OnlineMapsControlBase3D.instance;

            if (control == null)
            {
                Debug.LogError("You must use the 3D control (Texture or Tileset).");
                return;
            }

            // Marker position. Geographic coordinates.
            Vector2 markerPosition = new Vector2(30.341355816183523f,-97.91188041419034f);

            // Create 3D marker
            marker3D = OnlineMapsMarker3DManager.CreateItem(markerPosition, markerPrefab);
            marker3D.altitude = 300;
            // Specifies that marker should be shown only when zoom from 1 to 10.
            marker3D.range = new OnlineMapsRange(1, 20);
        }
    }

so it appears at the corner of the map, and very much below the map.

The easiest way is to create 3D marker and set the altitude.
https://infinity-code.com/doxygen/onlin … 1b4998fa1e
https://infinity-code.com/atlas/online- … ample.html

To make the marker scale with the map instead of having a fixed size, set sizeType = OnlineMapsMarker3D.SizeType.realWorld and the desired scale value.
https://infinity-code.com/doxygen/onlin … 88ac04bdca
When sizeType - realWorld, the marker instance will have the specified scale at maximum zoom and will be halved every zoom level.
For example, with scale - 100, marker.instance.transform.localScale will be:
Zoom 20 - {100, 100, 100};
Zoom 19 - {50, 50, 50};
...
Zoom 15 - {3.125, 3.125, 3.125};
...
etc.

How do I place the object in the 3D space?  I have an AGL (above ground level) altitude in Meters, and GPS coordinates.  Do I send the lon/lat/alt to a function in your API?  If so, what is the function?  If not, do I use the place marker to get the lon/lat, and then use something else to get the alt of the ground below my desired location and add my AGL altitude?  If so, what format do I need to convert the meters to?  Will I need to update this conversion based on zoom level?

I know... complex question, but I'm stuck... I'm very much hoping I can just send WGS83 lon/lat and meter alt to your script and plug that response into a transform or something.  I was very hopeful when I saw the flying airplane in your demo video.  Seems like that is exactly what I'm trying to do.