1
139 
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1. handheldQQÏ*.
2. PÒx> st3 Í' handheld3 Âý ) WH st
ÊÅ3!| c:.WH st  stx
\¼.handheld ¤ Bvx þ.
3. stWH st  ".
.
..
.:handheld; stx WH st  u,¹ ù
#..¤Õ6xicx $xP Û' P
6Nd WH st !P Ó' É ; st
Ë6 ë%.
   
;z,{|!}kt o Global Positioning System (GPS) î6O %&
A~66 tbc handheld!&8!(  ),
handheld'!ª«_x(c)*.tbc H3 O
JU|1 V)1º&HO  ¹ º .»¼.