how to maintain the location of a picturebox in the panel - vb.net

Question

i want to maintain the location of picturebox2 which is inside a panel. in my case, the image looks like this.. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ8SUu7ZXBJVXrhic-Xou9OsW4h7QDd8yH5xhYtV3DlnJ0Q1UVJiw (there's a map /picturebox1/ and the color green locator or pointer is another picturebox /picturebox2/)
is it possible to zoom in and zoom out the image without losing the right coordinates? Because i want to maintain the location of the locator(picturebox2) in the map (picturebox1)
so far, i can now zoom in and zoom out the image in the scrollable panel using trackbar. but my only problem is that, the picturebox2 (another image above the picturebox1) needs to move its location as picturebox1 is zooming.
Public ClassForm1
Private img original As Image
Private m_PanStartPoint As New Point
Private n_PanStartPoint As New Point
Private Sub Form1_Load(ByVal sender AsSystem.Object, ByVal e AsSystem.EventArgs) Handles MyBase.Load
imgoriginal = Image.FromFile("C:\New Folder\picture1.jpg")
PictureBox1.BackgroundImageLayout = ImageLayout.Stretch
zoomSlider.Minimum = 1
zoomSlider.Maximum = 5
zoomSlider.SmallChange = 1
zoomSlider.LargeChange = 1
zoomSlider.UseWaitCursor = False
Me.DoubleBuffered = True
Panel1.AutoScroll = True
PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize
PictureBox1.Parent = PictureBox1
PictureBox2.Parent = PictureBox1
PictureBox1.BackColor = Color.Transparent
Dim mstream As NewSystem.IO.MemoryStream()
PictureBox1.Image = Image.FromStream(mstream)
PictureBox2.Location = NewSystem.Drawing.Point(100, 100)
End Sub
Public Function pictureboxzoom(ByValimgAsImage, ByVal size AsSize) AsImage
Dim bm As Bitmap = New Bitmap(img, Convert.ToInt32(img.Width * size.Width), Convert.ToInt32(img.Height * size.Height))
Dim grap As Graphics = Graphics.FromImage(bm)
grap.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic
Return bm
End Function
Private Sub zoomSlider_Scroll(ByVal sender AsSystem.Object, ByVal e AsSystem.EventArgs) Handles zoomSlider.Scroll
If zoomSlider.Value> 0 Then
PictureBox1.Image = Nothing
PictureBox1.Image = pictureboxzoom(imgoriginal, New Size(zoomSlider.Value, zoomSlider.Value))
End If
End Sub
Private Sub PictureBox1_MouseDown(ByVal sender AsObject, ByVal e AsSystem.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
m_PanStartPoint = NewPoint(e.X, e.Y)
End Sub
Private Sub PictureBox1_MouseMove(ByVal sender AsObject, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
If e.Button = Windows.Forms.MouseButtons.Left Then
Dim DeltaX As Integer = (m_PanStartPoint.X - e.X)
Dim DeltaY As Integer = (m_PanStartPoint.Y - e.Y)
Panel1.AutoScrollPosition = _
New Drawing.Point((DeltaX - Panel1.AutoScrollPosition.X), _
(DeltaY - Panel1.AutoScrollPosition.Y))
Button1.Location = New System.Drawing.Point(0, 0)
End If
End Sub
End Class