The Holoswim 3 Pro goggles recorded what the reviewer believes is the first publicly shared open-water GPS track captured by commercially available swim goggles. The test compares that track to a Garmin Fenix 9 Pro and an Apple Watch Ultra 4, and covers GPS chipset, accuracy, HUD and ecosystem trade-offs.
Holoswim 3 Pro produced a usable open-water GPS track but was less accurate than the Garmin Fenix 9 Pro and Apple Watch Ultra 4 on the same swim.
The goggles use the dual-frequency Airoha AG3335M GNSS chipset. HoloSport issued a GPS accuracy update after this test.
HUD, fit and display are preferred to FORM by the reviewer, but FORM’s training ecosystem remains stronger for technique and performance users.
# What happened The reviewer recorded an open-water swim with Holoswim 3 Pro smart goggles and compared the GPS track to two sports watches: a Garmin Fenix 9 Pro and an Apple Watch Ultra 4. The Holoswim file had to be exported through HoloSport's web dashboard because the smartphone app couldn't yet export GPS data directly.
# How the GPS compared The Holoswim track was noticeably less accurate than the two sports watches on that outing. The reviewer cites an average 17.8 m distance discrepancy between the Holoswim track and the other devices, though they express uncertainty about that single-number summary and note GPS variation by location and moment.
The reviewer also points out a procedural detail that could have introduced error: they started each device simultaneously while in the car park before walking to the water to ensure a strong satellite fix. That may have removed one error source but introduced another in how the devices recorded the start.
# Technical details Airoha AG3335M GNSS chipset, a dual-frequency module that supports GPS, Beidou, GLONASS and Galileo. The brand released a GPS accuracy update after this particular test, which could change results in later comparisons.
# HUD, fit and ecosystem The reviewer prefers Holoswim's physical fit and HUD design to FORM's Smart Swim. Holoswim's HUD uses a different image-projection method that avoids the field-of-vision restriction the reviewer experienced on FORM goggles. Holoswim also offers a larger metric display area and higher pixel resolution, which the reviewer liked.
Despite those advantages, FORM currently has a stronger ecosystem for swim training, with better tools for technique and performance analysis. Holoswim costs less than the top FORM model and may suit early adopters who prioritize hardware fit and in-goggle metrics over a mature training platform.
# Heart-rate options
# Price and availability
# Bottom line This test appears to be the first public open-water GPS track recorded by commercially available swim goggles. The Holoswim 3 Pro can capture a usable GPS track, but in this comparison it lagged behind a Garmin Fenix 9 Pro and an Apple Watch Ultra 4 in raw positional accuracy. Follow-up testing after the vendor's GPS update and the release of the head HR feature will give a clearer picture of where the product sits for training-focused swimmers.
HoloSwim 3 Pro puts a working GPS and compass inside a swim goggle, a first for the category. First impressions cover fit, HUD readability, battery life, and how it compares to FORM's Smart Swim 2 PRO on price and features. Read the full post at HoloSwim 3 Pro: First Thoughts on GPS Swim Goggles . Subscribe to the5krun
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