Warning horn steady beep

[PA_Mike 0]

Was out on the water the other day and was heading out to our favorite surfing spot. Upon reaching 30 mp , a steady warning horn went off until I slowed below 30 mph. This is the second or third time this has happened. Each time it was just after putting the boat in the water. I always let the engine warm up while waiting for the truck driver to join us. The engine temp was a steady 175 deg. After slowing below 30 mph, the horn stops and after about ten minutes of boating, I can go above 30mph with no horn. The boat is a 2007 Enzo230 with the Black Scorpion engine. Any ideas would be appreciated. As a note, I check the engine oil level and V Drive oil level on a regular basis (on the trailer). Thanks again.