GPS / GLONASS ChipSet Comparison Table
ChipSet Name
MTK II
(GPS)
SkyTra
Venus 6
(GPS)
SiRF IV
(GPS)
65 nm
SiRF III
(GPS)
MTK 3333
(GPS +
GLONASS)
ST
(GPS +
GLONASS)
Number of
Channels
66
65
48
20
66
34
Sensitivity Rating
(Negative lower is
better)
-165dBm
-161dBm
-163dBm
-159dBm
-165dBm
-155dBm
Power
consumption
(lower is better)
very low
low
the lowest
low
low
low
TTFF
(Time_To_First_Fix
)
fast
very fast
fast
fast
ver fast
very fast
Cold Start (Sec)
35
< 30
35
<35
< 31
< 30
Editor's Ranking
* * * *
* * *
* * * *
* *
* * * * *
* * * * *
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-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

Canmore GP-102+
i-gotU
GT-120

i-gotU
GT-600
Holux M-215+
Canmore
GT-730F(G)
 
 
 
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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
IV"?

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.

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