Jeff,
On most power boats the radar is angled down so when the boat is
underway on plane the radar is now level.
Paul


Jeff wrote:

The beam width of small radars is +-12.5 degrees. Thus, if you're
heeling 15 degrees (assuming no leveling device) you're seeing almost
nothing to windward or leeward. If you're bouncing that much, your
signal is intermittent. And if you're a powerboat at speed with the bow
raised 15 degrees, you could be blind in front!