A guides job is to put you on fish and show ya what it takes to catch em. I don't charge much but make it clear no GPS allowed in my boat. But I will give them some spots (gps coordinates). I have had folks say other guides let them mark everything fished. My question to them is what did they charge ? Usually it is 2 to 3 times what i charge. I tell them if they will pay me the same then bring GPS , but they decline . On my Catfishing trips they are spots I bait almost daily so it is definitely a no GPS rule. Most understand and some even thank me later when they take info learned home and repeat the process.