>
<dd><p>an <a href="adp-class.html">adp</a> object.</p></dd>


<dt id="arg-declination">declination<a class="anchor" aria-label="anchor" href="#arg-declination"></a></dt>
<dd><p>magnetic declination to be added to the heading after
"righting" (see below), to get ENU with N as "true" north.  If this
is set to NULL, then the returned object is set up without adjusting
the compass for declination.  That means that <code>north</code> in its <code>metadata</code>
slot will be set to <code>"magnetic"</code>, and