Cross Scene Object Placement

class MapScene extends Phaser.Scene {

    constructor ()
    {
        super('MapScene');

        //  Sphinx
        this.location1 = new Phaser.Math.Vector2(766, 1090);

        //  Oasis
        this.location2 = new Phaser.Math.Vector2(225, 1552);

        //  Tomb
        this.location3 = new Phaser.Math.Vector2(700, 1592);

        //  City Gates
        this.location4 = new Phaser.Math.Vector2(323, 480);

        //  Chair
        this.location5 = new Phaser.Math.Vector2(593, 274);

        //  River Hormuz
        this.location6 = new Phaser.Math.Vector2(180, 1087);

        //  Guard Outpost
        this.location7 = new Phaser.Math.Vector2(168, 163);
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.image('map', 'assets/tests/camera/earthbound-scarab.png');
    }

    create ()
    {
        this.cameras.main.setBounds(0, 0, 1024, 2048);

        this.add.image(0, 0, 'map').setOrigin(0);

        this.cameras.main.setZoom(1);
        this.cameras.main.centerOn(0, 0);

        var pos = 1;

        this.input.on('pointerdown', function () {

            var cam = this.cameras.main;
            var location = this['location' + pos];
            var rndZoom = Phaser.Math.FloatBetween(0.5, 4);

            cam.pan(location.x, location.y, 3000, 'Sine.easeInOut');
            cam.zoomTo(rndZoom, 3000);

            pos++;

            if (pos === 8)
            {
                pos = 1;
            }


        }, this);

        this.scene.launch('UIScene');
    }

}

class UIScene extends Phaser.Scene {

    constructor ()
    {
        super('UIScene');

        this.mapScene;
        this.mapCamera;

        this.graphics;

        this.tooltip1;
        this.tooltip2;
        this.tooltip3;
        this.tooltip4;
        this.tooltip5;
        this.tooltip6;
        this.tooltip7;
    }

    create ()
    {
        this.mapScene = this.scene.get('MapScene');

        this.mapCamera = this.mapScene.cameras.main;

        this.graphics = this.add.graphics();

        this.tooltip1 = this.add.text(0, 0).setText('Sphinx');
        this.tooltip2 = this.add.text(0, 0).setText('Oasis');
        this.tooltip3 = this.add.text(0, 0).setText('Tomb of Ket');
        this.tooltip4 = this.add.text(0, 0).setText('City Gates');
        this.tooltip5 = this.add.text(0, 0).setText('Rest Easy');
        this.tooltip6 = this.add.text(0, 0).setText('River Hormuz');
        this.tooltip7 = this.add.text(0, 0).setText('Guard Outpost');
    }

    update ()
    {
        this.graphics.clear();

        this.updateToolTip(this.mapScene.location1, this.tooltip1);
        this.updateToolTip(this.mapScene.location2, this.tooltip2);
        this.updateToolTip(this.mapScene.location3, this.tooltip3);
        this.updateToolTip(this.mapScene.location4, this.tooltip4);
        this.updateToolTip(this.mapScene.location5, this.tooltip5);
        this.updateToolTip(this.mapScene.location6, this.tooltip6);
        this.updateToolTip(this.mapScene.location7, this.tooltip7);
    }

    updateToolTip (source, tooltip)
    {
        var basePosition = source;
        var camera = this.mapCamera;

        //  The marker point
        var x = (basePosition.x - camera.worldView.x) * camera.zoom;
        var y = (basePosition.y - camera.worldView.y) * camera.zoom;

        var graphics = this.graphics;

        graphics.fillStyle(0x000000, 0.8);
        graphics.lineStyle(4, 0x000000, 0.8);

        //  The text is above this point
        var width = tooltip.width + 32;
        var height = tooltip.height + 32;

        var bx = x - width / 2;
        var by = y - (height + 32);

        graphics.fillRect(bx, by, width, height);

        tooltip.x = bx + 16;
        tooltip.y = by + 16;

        graphics.lineBetween(bx + 16, by + height, x, y);
    }

}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    pixelArt: true,
    parent: 'game-container',
    scene: [ MapScene, UIScene ]
};

const game = new Phaser.Game(config);