only about 50% of the maps are 'near' tmap locations, although I have yet to find one "ON" a tmap spot exactly. I have 3 full rune books of marked turkey maps, some of which are for 2-4 actual turkey map spots (ie a screen or so run from the mark to a few locations)
I am so turkey mapped out I am done lol. I really wanted a few of the harvester blades for my chars, well all my chars, but given after 309 nests I had only 6 plucked turkeys, so a turkey & blade for the 'museum' and another 4 blades for my chars, means only 4/7 on my first account will get blades lol. The others are just gonna need to 'miss out' as I have had it up to my neck in the darn things lol. Maybe the rng hates me but an avg of 1:50 on plucked turkeys is pretty grim. I think I only had 2 plucked turkeys from the turkey bodies, the rest from cracking eggs. Either way, given that not all 'turkey kills' result in a full map (may need to kill 3 to get a 'whole' map from fragments) with 309 nests dug up I guess you see how many stupid things I have killed.
Anyways if you need a hand digging up nests give me a yell.