Custom tag, one more question

Hello, One more question.... I want to put some custom feed tag in my post. I want the "geo:lat" -41.1619. I think this is custom tag name. I try everything such as geo:Point before the geo:lat and after the geo:lat. Also use the custom_feed_..... in the rss settings. And i use also the Feed item custom tag names and then custom_..... And i changed the tag separator one time from : to . But nothing works. So maybe you see directly what i am doing wrong:.... <div class="line"><span class="html-tag"><item></span></div> <div class="opened"> <div class="line"><span class="html-tag">    <title></span>Green earthquake alert (Magnitude 5.6M, Depth:10km) in Southeast Of Easter Island</div> <div id="folder11" class="folder"> <div class="line"><span class="html-tag"><geo:Point></span></div> <div class="opened"> <div class="line"><span class="html-tag">     <geo:lat></span>-41.1619<span class="html-tag"></geo:lat></span></div> <div class="line"><span class="html-tag">     <geo:long></span>-89.8851<span class="html-tag"></geo:long></span></div> </div> <div class="line"><span class="html-tag"></geo:Point></span></div> </div> </div> <div></div> <div>Thanks in advance</div>