ber of seconds since last DGPS update</p>
<div class="aside aside-warning">
    <p class="aside-title">Warning</p>
    <ul>
<li>This attribute may not be useful.</li>
<li>This is carried over from GPX schema, to be compliant with the schema.</li>
</ul>

</div>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                      