howdy abismail,the simplest answer to your query is,any round coil with a diameter greater than 11 inches should go deeper than your 11RM commander.(RM=round,mono)next is the nugget finder 12inchRM.then the 14RM's.16RM's,etc.the rule of thumb for the elliptical (oval shaped) coils is,with some debate,add the two dimensions,say 14x9,then divide by 2 for comparison to round coils.thus 14x9=23/2=11.5.but in practice,and strictly in my opinion,the 11RM commander will sniff em out deeper than the 14x9 (generaly).have not used the 14x9 blitz goldstalker yet,but 4 years with my 4500 and a 14x9 non blitz goldstalker(probly my main coil)has convinced me that its hard to beat the 11RM.at least on my machine.and what i would mainly consider,while searching within an area known to produce detectable gold,success will be measured by number of targets dug.the ratio might be 100 trash/1 gold,or 50/1,or 200/1,whatever it is,you will hear,pinpoint,dig,isolate,secure the target faster with that 11rm,and move on to find the next target,and thus have better chance of success than with a larger coil.which will have you digging huge holes,with huge spoil piles,taking too long to find that clay encrusted 22 short empty cartridge,or worse,a tiny copper or lead bullet frag that screamed from 2 or more feet deep.magnets no help here,only mucho practice helps this process.i consider target acquisition/id,on to next one the main obstacle once in the field.prior to having advanced skills,a large coil can discourage/hinder the learning process crucial to this art.have confidence in your 11rm,or whichever coil you decide upon.and then stick to it.early on,your mental process/confidence level arwe your best friends/worst enemies,.hope this helps,good huntin
ok,i understand now,have heard of some compatability issues with the 5000 and nuggetfinder coils.some 5000 users have no problems,many others report erratic behavior.(gpx5000 with nfa coils)i have a nuggetfinder 14rm,superlite series for my 4500,is a very good coil for early hours,when the atmospheric disturbances are minimal,and away from micro-towers,air traffic,etc.heat,thunder clouds,etc,late day conditions make my nugfinder coil unstable,is also more touch sensitive,prone to falsing when bumped against rocks etc.i think the nuggetfinders,on a well tuned gpx,and in stable atmospheric conditions,with the coil lead properly stabilised to shaft just above coil,is slightly better than any other coil.and provided the particular gpx machine/coil work well together.believe it or not,these machines can have their own personalities.this comes to mind when considering nuggetfinder/gpx5000 combos.some work,others dont.the goldstalkers are a sure thing,in my opinion.there is rarely anything else on my machine.can you buy them in your country?
