| ChipSet Name |
MTK II |
SkyTra Venus 6 |
SiRF IV |
65 nm SiRF III |
90 nm SiRF III |
ST |
| Number of Channels |
66 |
65 |
48 |
20 |
20 |
34 |
| Sensitivity Rating (Negative lower is better) |
-165dBm |
-161dBm |
-163dBm |
-159dBm |
-159dBm |
-155dBm |
| Power consumption (lower is better) |
very low |
low |
the lowest |
very low |
high |
low |
| TTFF (Time_To_First_Fix ) |
fast |
very fast |
fast |
very fast |
slow |
the fastest |
| Cold Start (Sec) |
35 |
< 30 |
35 |
<35 |
42 |
< 30 |
| Editor's Ranking |
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| Loggers / Receivers using this GPS Chipset. |
Qstarz BT-Q1000XT Qstarz BT-Q1000XTM Qstarz BT-Q1000eX Qstarz BT-Q1300ST Qstarz BT-Q818XT Qstarz LT-Q6000 Columbus V-900 Columbus V-990 Columbus V-800 Columbus V-800+ |
Canmore 750F(L) Canmore 750F Canmore GP-102 Canmore GP-101 |
i-gotU GT-900 i-gotU GT-900Pro i-gotU GT-900Pro HRM i-gotU GT-820 i-gotU GT-820Pro i-gotU GT-820Pro HRM GlobalSat BU353-S4 Canmore GT-730FL-S Canmore GT-740FL |
i-gotU GT-120 i-gotU GT-600 |
Canmore GT-730F(G) |
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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.
IV"?
MTK II chipset GPS has 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.
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