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i have the qstarz 818. essentially the 1000 sans data logging. which is essentially the iblue 737. works great. great battery life, no problem picking up satelites. its a mtk based module, so battery life is better, picks up more satelites, but updates slower than a sirfiii so if you hike or walk alot get a sirfiii. i got mine from buygpsnow. i used a 10% code i found on the net, and total price inc shipping was 67.xx
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