Letham, Lawrence. <br/><br/>
GPS made easy :  using Global Positioning Systems in the outdoors / 
 Global Positioning System made easy 
Lawrence Letham. 
 - 4th ed., WAAS rev. 
 - 208 p. :  ill., maps ;  22 cm. 
<br/><br/>Includes bibliographical references (p. 205) and index. 
<br/><br/><label>ISBN: </label>0898868238 9780898868234 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Outdoor recreation--Equipment and supplies.<br/>Global Positioning System.<br/>Orienteering--Equipment and supplies.
<br/><br/><label>LC Class. No.: </label>GV191.623  / .L48 2003 
<br/><br/><label>Dewey Class. No.: </label>796.51/028/4