Can't help you with actual marks down there , but if you have a plotter with a card in for the local area all the wrecks will be on there , they might be a few yards away from where they say they are but do a few zig zags over the area and you will find them , have a look here
WRECK
you can find any wreck in your area on this site , it costs , but it's well worth it if you want to find the good wrecks.
545121.0N, 011542.7W 545050.4N, 011527W 544931N, 011408W 545030N, 011230W.
These are the closest 4 wrecks off seaham , they are all "live" which basically means they are still there and recognisable as wrecks. They are all in about 60ft of water and are all about 3 miles off seaham .
It took me 5 minutes to find them , there are at least 30 within 6 miles of seaham , it's up to you to go out , plot them and find out how and when they fish though
Ray