I hit them frequently at the lakes I hunt. I look for sandy shores next to the ramp. This is where people will sit on the bank watching and waiting for rides etc. etc.
I've hit several pocket spills doing this. In fact, on one sandy beach next to a ramp, I hit three pocket spills totaling just over $10.00. One of the spills had a $5 bill wrapped around coins. I tend to travel out chest deep around the ramps as well. I predict that people will jump in and out of their boats into waist deep water possibly shedding items and coins.
I also have a bucket of lead weights and a million pull tabs but, with the right scoop, digging isn't so bad.
If it's easy digging, I enjoy the heck out of boat ramps. My BHID300 alllows me to skip all the iron that's out there. Now if I were to hunt a ramp at the ocean, I'd hunt it with a DF or the BHID in All Metal. I would hunt 100 feet either side of a ramp at the ocean if there were beaches where boaters would land their boats for pick up and drop off of personnel or run back to the vehicle for forgotten items.
Coolwhips