The GNSS chipset is probably the most significant factor when it comes to the accuracy and reliability of GPS watches. Additional factors include antenna design, GNSS firmware, watch firmware, and user settings. The activity mode and / or app choice are also really important.
This page lists the GNSS chipsets of the many Garmin watches that people may wish to use for GPS-Speedsurfing (GP3S). The information is intended for people choosing a Garmin watch, or curious about the suitability of their current watch.
GNSS details are provided for the following Garmin watches:
The following Connect IQ apps are worth trying:
The following Connect IQ data fields worth trying:
These series are rarely used on GP3S, despite being supported by the recommended apps:
These series are rarely used on GP3S (nowadays) and not supported by the recommended apps:
These series are not listed on GP3S and not supported by the recommended apps:
Most of the information has been gleaned from watch reviews, disassembly / teardown photos, testing and / or deduction.
Chipsets for the very oldest watches have been determined using a variety of sources, including fellrnr.com and test results by Mark Gee.
API levels obtained from Garmin developer site.