In zitaSport blog have also taken an interest in better understanding the GPS chip integrated in the more valuable models of the main brands in the sector. The GPS chip is not the most important factor in the accuracy of Garmin, Polar, Suunto and TomTom, there are some other ones. For this reason is not easy to understand how complicate is to find information about it. In internet the information is limited and not very reliable.
The accuracy in a GPS watch is affected by many different factors. First of all, the specific features of the watch. The antenna design is important, the radio receiver design (frequently part of the GPS chip), the chip in its own and the firmware.
The GPS chip is not the most important, a good antenna can compensate some limitations, as well as a good firmware development, but the chip may limit the real potential of the watch. Some chips are already design to get connected to the GLONASS satellites, and all of them should offer the lowest battery consumption possible.
The accuracy could be affected also for other factors related to the collect and data processing of the watch: (1) the amount of data stored by the watch in every track, (2) the webs in charge of the data processing, smoothing them, based sometimes in the Kalman Filter, (3) corrections by WAAS and EGNOS, and (4) the number of available satellites.
Finally, the interferences in the emitted signal via satellite can affect also, there are different kind of them: (1) electromagnetic interferences, (2) atmospheric interferences or even (3) a poor signal of the satellite.
The table below is opened to the correction of anyone. Our aim is to get it complete with all the comments you leave. You can make comments about the brands and models in the table, or even add information of any other brand, Timex?, Geonaute?, Adidas?, Bryton?, Nike?, O-Synce?, Soleus?… there’s still many work to do. We promise update the table with the information you provide.
You will find three different colors in the table: green means that the information has been confirmed by the brand (Suunto and TomTom). Blue, the information is highly reliable. Black, the information has not been confirmed but denied either.
|BRAND||MODEL||YEAR||BrandGPS CHIP||ModelGPS CHIP||COMMENTS|
|Polar||V800||2014||SiRF||STAR IV||Instant Fix|
|Polar||RC3 GPS||2012||SiRF||STAR IV|
|Polar||Sensor G1, G3 y G5||2011||SiRF||STAR III|
|Suunto||Ambit3||2014||SiRF||STAR V (NO GLONASS)||Instant Fix / ceramic antenna|
|Suunto||Ambit2 R||2014||SiRF||STAR IV||Instant Fix / ceramic antenna|
|Suunto||Ambit2 S||2013||SiRF||STAR IV||Instant Fix / ceramic antenna|
|Suunto||Ambit2||2013||SiRF||STAR IV||Instant Fix / ceramic antenna|
|Suunto||Ambit1||2012||SiRF||STAR IV||Instant Fix / ceramic antenna|
|TomTom||Multisport Cardio||2014||SiRF||STAR V||GLONASS, QuickGPSFix|
|TomTom||Runner Cardio||2014||SiRF||STAR V||GLONASS, QuickGPSFix|
|Garmin||Epix||2015||Antenna EXO™||HotFix®GPS /GLONASS|
|Garmin||Fenix3||2015||Antenna EXO™||HotFix®GPS /GLONASS|
|Garmin||FR610||2011||SiRF||STAR IV||Instant Fix II, HotFix|