I`m trembling with excitement waiting for #^&#^&#^&#^&#^&#^& to get back from Cutty and read all his fan mail
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JR..... rocks and reefs are tougher on the body if you do a lot of moving about or swimming to them and readings ok if you scout at low. Rocks are very dangerous.
The sand requires more research I think due to its everchanging structure and walking in soft sand is a killer with waders and gear.
I`d say both are equally difficult for varying reasons.