This is my first post. I'm a newbie and have only just started metal detecting so go easy on me!

I have been out a few times searching a local river and have a couple of questions...
Firstly, what gloves would you recommend to search on the river bed with? It is extremely rocky unfortunately so the last few times I have been out has almost worn my fingernails down to the bone which I know you shouldn't really do!!
Secondly, are there any tried and tested methods for getting the best results from rocky rivers? I have a scoop but this is no good on the rocks. In shallower areas I have my hands down but it is quite a sooty river so visibility can be a little poor!
One thing I definitely need is a waterproof pinpointer. I've read the Vibra-Probe is the only waterproof unit... Is there anywhere in the UK I can get one from?
Cheers in advance for your replies!
John