private void but_base_pos_Click(object sender, EventArgs e)
{
string basepos = Settings.Instance["base_pos"];
if (InputBox.Show("Base POS", "Please enter base pos location 'lat,lng,alt,name'", ref basepos) ==
DialogResult.OK)
{
Settings.Instance["base_pos"] = basepos;
loadBasePOS();
}
else
{
this.basepos = PointLatLngAlt.Zero;
}
}