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Garrett Sea Hunter Mark II
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Fisher Impulse


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Garrett Sea Hunter Mark II
Fisher Impulse
Feature comparison between Garrett Sea Hunter Mark II and Fisher Impulse
Options Garrett Sea Hunter Mark II Fisher Impulse
Detector Type PI Beach Detector PI Beach Detector
Price $750 $700
Manufactured in 2000 1994
Battery Type 8 AA 8 AA
Weight (Lbs.) 5.1 5.2
Operating frequency 750 PPS, Adjustable 5.333 PPS
Display None Yes
Backlight No No
Target ID Audio+LED Light
Tone ID Single
Search Modes
  • All Metal
  • All Metal N/M
Ability to change coils Yes No
Ground balance Auto Auto
Waterproof 200 feet 250 feet
Warranty 1 Year Lifetime
Number of Reviews graph 26
graph 7
graph 4
graph 1
graph 1
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Avg. User Rating 4.53 4.33
Avg. Durability Rating 5.00 5.00
Avg. Ease of Use Rating 4.43 4.50
Avg. Depth Rating
Depth value
Depth value

Most helpful review for Garrett Sea Hunter Mark II

Great machine... Know what you are doing
To call this machine rubbish or junk is just ignorant. I've used PI machines for years in many places and I know them well, so I will try and help some people out with this review.

The SHM11 is a machine for diggers. Period. If you don't like to dig nails, or bottle caps, or fish hooks, sinkers, etc... Don't get this machine, but you will miss the pleasant surprises that come from hearing a very faint, sometimes almost imperceptible tone, taking a scoop, getting louder, another scoop, blowing your ears out , and BAM! A nice gold ring in the scoop that the VLF guys went right over.

There is a phenomenon with PI detectors that causes them to detect objects deeper in salt water and wet salt sand than in air alone, so air tests are not accurate. Because it is a PI machine, iron reads as a good conductor, so there is NO WAY you can discriminate iron, and any amount of an attempt at discrimination will cost you depth.
This is what you have to do... Run on zero discrimination on standard mode and forget discreet mode, It costs you depth. There will be a natural wavering of the tone, and in highly mineralized sand you will get a false signal if you touch the coil to the sand, but you will get a slight, or loud, sharp, REPEATABLE increase in volume when you go over a target.

No matter what Garrett tells you, or anyone tells you, you can NOT eliminate an aluminum pop top and still pick up a gold ring. It is the science of metal, not my opinion.
Gold is lower in conductivity than aluminum and the size an karat amount will determine how hard it is to detect. Gold is a POOR conductor. It is used in electronics for it's high corrosion resistance, not conductivity. You may get lucky and pick up large, thick men's rings with disc. set higher, but you will miss a lot.

If you live on the Texas Gulf coast where there are lots of nails and junk in the water, you either dig until you are sore, or try a VLF detector that will discriminate iron. High trash areas will be frustrating and discouraging.

Here is a good way to find out if you will find gold rings... No nickels dug, No pull tabs dug = No gold rings dug. It is that simple. As far as quality of the machine... It is built like a tank. Very durable and leak proof.

The volume is loud because it is a DIVING detector. Divers need the loud volume to hear targets over their bubbles. As far as Garrett goes, I don't think anyone can dispute that their customer service is the best in the business. If you have a problem, just call them and they will make it right by you, without fail.

Brand bashing is irresponsible and I have tried a lot of the leading brands. They all have pros and cons, features that I liked, and some I disliked. No machine is perfect for all applications. It is unreasonable to think anyone can build a machine that is, because it is impossible. Detecting successfully is a science, you don't learn it all in a week, a year, or ever. It is a never-ending learning process.

If you do decide on the Sea Hunter... Read some books, turn your disc. down to zero, be persistent, learn your machine, slow down and enjoy being outside and getting some exercise. You will be rewarded over time...

I hope I helped some of you with facts I learned the hard way and from men who knew a lot more than I.
Aaron from Maui, HI USA

Thumbs up! 287
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Most helpful review for Fisher Impulse

Fisher impulse
This is my first Fisher detector. When I decided to get this detector it was because I heard it had good depth.

When my wife and I go out detecting, it's usually Friday till Sunday, and the ability of Fisher to work on 8 AA batteries for 6 months is outstanding, plus to change them is simple. Some detectors you have to plug in every night to get a hunt out of them.

It's a non-motion detector, which I like. I would not recommend this unit for a beginner water-hunter because unlike other detectors, you must have three arms to operate this unit.
One for your scoop, one for holding the detector, and the other for continually adjusting the detector "sensitivity" knob.

Using it at the beginning was hard and the threshold was annoying.
It took me some time to get used to it. It is the same in fresh and salt water. As soon as you take a step deeper, the threshold changes so you have to walk in a straight line parallel to the shore. It works in wet sand but you get better depth in the water.

I would suggest to the manufacturer that the sensitivity knob should either be made a bit tighter cause even a light touch will change the sensitivity. I had to take the knob off and wrap a rubber band around the pin.

Overall I have had very good luck with the Impulse.
I would estimate the depth on a medium size gold ring to be about 18 to 24 inches. I have dug some pretty deep holes.


If Fisher could make the threshold stable, with the same depth, performance and the same price tag, I 'll be the first in line.

I normally don't carry a measuring tape with me, but my non scientific guess would be, I could get a 12-14 inches on a US quarter when there is no wind and the water is calm using a 10 inch coil.
Vlad from CT

Thumbs up! 119
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