Last week ran static using 3 Locus near Lake Travis, Austin, Texas. Had one control point at the edge of the water (in fact 1/2-ft under the water). It worked great! The check-ins gave me an avg of .005 ft horizontal and .015 vertical. Using some of the other brands with dual frequency I've seen multipath big time in this sort of senario. 3 of the sv's were NE over the lake so the multipath could have happened. Also checked a couple of vectors with the total station and they agreed within 0.01 ft. Anyhow-now I'm a believer.

To be fair, the effects of mulipath are an issue where the observation is of short duration, ie an RTK fix of only a few epochs or a single fix with a handheld, regardless of the brand of receiver. The effects are mitigated to a large degree over longer sessions such as occur with static observations as the satellite geometry changes.

But that doesn't take away from the results you obtained. The Locus is an excellent single frequency work horse.

Around 6 years ago, I was using a Leica dual frequency system in a similar static situation setting "master" control points for a wetlands mapping. I used 20 minute sessions and the vectors blew up right & left until I redid the survey by moving the control away from the water. I now tend to be paranoid about enviornment that can reflect radio wave such as water, chain link fences, or vehicles.