GNS 2000 GPS GLONASS Receiverhttp://www.gns-gmbh.com/shop/xtc/product_info.php?info=p203有比這個猛嗎MT3333high sensitive 99-channel GPS/GLONASS chipworldwide support for WAAS/EGNOS/QZSS/MSAS/GAGAN, SBAS enabled寄信詢問殘念 update rate 1Hz