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VB.net form for converting DMS to Decimal Degrees

Nate_LR
Nate_LR asked
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Last Modified: 2013-05-22
I'm trying to create a simple form to convert degrees minutes seconds to decimal degrees, but I'm having trouble when converting negative numbers.  When I try to convert -92 7 6.52 I get -91.8815222 but the answer should be -92.118478.  Why is this simple formula not working?
Private Sub btnDecimal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDecimal.Click

        'txtLatDecimal.Text = Math.Round(CInt(txtLatDegrees.Text) + (CInt(txtLatMin.Text) / 60) + (CDec(txtLatSec.Text) / 3600), 7)

        'txtLngDecimal.Text = Math.Round(CInt(txtLngDegrees.Text) + (CInt(txtLngMin.Text) / 60) + (CDec(txtLngSec.Text) / 3600), 7)

        txtLatDecimal.Text = Math.Round(((CDec(txtLatSec.Text) / 60) + CInt(txtLatMin.Text)) / 60 + CInt(txtLatDegrees.Text), 7)
        txtLngDecimal.Text = Math.Round(((CDec(txtLngSec.Text) / 60) + CInt(txtLngMin.Text)) / 60 + CInt(txtLngDegrees.Text), 7)

    End Sub

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