This Landing Height System is FAA-approved for installations on FAA-certified airplanes.
It includes a built-in eye-safe Class 1 Laser (Light Detection and Ranging) along with an audio interface system so height announcements can be heard when coming to land.
The Landing Height System offers situational awareness aid, added safety, and great advantages.
This unit is approved for installation on an access panel or inspection plate internally (above the access panel; inside the wing or fuselage).
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
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The LHS is not approved for installation on an amphibian or sea airplane. This is by Certification.
For a more technical reply; the LHS uses a laser based element; if the water is choppy with some ripples; it may provide a good range; but if the water surface is crystal clear; laser will penetrate the water and not bounce back correctly to provide a good range.