500 feet. You really need to get a copy of the Presque Isle Park regulations as well. There are certain areas of the Park that are off limits to hunting and even standing. You also have Coast Guard Regulations in effect regarding channels. Make sure you research EVERY rule and regulation---they have had enough of people abusing the rules and will be enforcing them this year with an iron fist.
I've hunted from a layout boat in the bay, and on calm days in the lake. It is an equipment heavy sport, ,but can be a ball on some days.
Safety is paramount. Wear a float coat or auto-inflat suspenders.