eiru_pos_gps/views/res_partner.xml

<?xml version="1.0"?>
<openerp>
    <data>
      <record id="gps_partner_form" model="ir.ui.view">
            <field name="name">gps_partner_form</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='website']" position="after">
                  <field name="gps" widget="url"/>
                </xpath>
            </field>
        </record>
    </data>
</openerp>