The Garmin quatix 7 Pro is built for the marine environment and possesses a number of features useful to commercial fishermen ...

The SiRFstarIIA takes the industry's leading GPS engine and incorporates it into a multifunction system-on-chip (SoC). It starts with SiRF's ... The SiRFstarIIA may also be used as the core processor ...

Garmin accounted for this while designing their best watches. They utilized low-powered GPS chips (instead of the Sony GNSS chips they were using) while focusing on flexibility with their tracking.