GPS / GLONASS ChipSet Comparison Table
Why more GPS channels, better accuracy.
General speaking, we need 1 channel per GPS satellite. There are only 30 satellites in the system & why we need so many channels
in the GPS receiver/logger?
According to GPS algorithm, bigger number of satellites a GPS tracks at a time, better accuracy the GPS can calculate.
In a period of time, some GPS satellites disappear from horizon & GPS receiver lost connection from them. Meanwhile, some other
GPS satellites appear. If the GPS is not able to “capture” those newly available satellites fast enough, the number of satellites track
by the GPS is reduced. Hence the accuracy will be reduced.
The speed of “capture” those newly available satellites are very important. In order to speed this up, GPS receiver must reserve a big
number of channels for searching new satellites all the time. You know, searching new GPS satellites is time consuming. That is the
reason so many GPS channels is needed. Till this moment, MTK II chipset has 66 channels, the most GPS channels in the market.
Buyers' Guide - Which GPS (chipset) shall I choose? "MTK II / MTK 3333", "SkyTra Venus 6 ", ST or "SiRF
MTK II & MTK 3333 chipset GPS have the best overall performance.
SkyTra Venus 6 chipset GPS has very good performance & affordable.
ST chipset GPS has the strongest reception & fastest cold start time
SiRF IV chipset GPS is famous for extra low power consumption.