Well, the CZ 21 of course!...A few guys I meet swing the 1280...but the real gold hunting and deep silver guys use the 21. Remarkable finds these guys rack up, even though we are in fresh water up here. The 21 is one of the top recommended rigs for salt water too, 21's only rival is "the ones that start with mine and end with lab"...I had a 21, found gold with it..sold it to a Forum member in FL who needed it more than I, will get another one if I ever have to hunt the salt..or take up diving with tanks again...
That said, you can use your 70 very much greatly,
as long as you are careful you dont get the box wet..and you know what? Most beach gold is really close by shore, wading depth, or up on the sand...the only bummer besides not getting the box wet, is those danged "fins" on the 11"dd! They sure make it hard to push through the water! If a fellow sawed them off, it would be great!
Most water rigs are horribly heavy and awkward, the 21 and 1280 being no exception, so you gotta waist or chest mount it if you are seriously hunting big expanses like what we got here, sometimes you are in the water, the next minute flying up the beach,...If a guy was going with a dedicated Fisher water rig, get the 21, waist mount it, and have a Merry Christmas!...
The 70 is what I used for many years hunting the dry sand expanses and wading, found me a lot of gold/silver just on account of its so darn fast and light that I could cover more productive ground in a shorter time than most fellows swinging water rigs...so I could smoke jump half a dozen beaches before the sun came up without getting tired, and the audio feedback, being superb, misses nothing!....heres a chain I found with the 70 a couple of months after I bought the thing...beach hunting, high sand...paid for it!
Mud.