ah800 = ap1000
I had an ah800 and when it finally died (after years of service), I got an Tillerpilot 1000.The 1000 popped right into place. I remember that the manuals were similar. I also sold the boat, so I do not have the manual, sorry.So you may try www.raymarine.com and go to Technical Help. Their manuals are on-line.Raymarine (formerly a division Raytheon) handles the recreation electronics. good Luck,Marc