AUDIO OUTPUT 

 Garrett XL500 



FAIR. The audible output from this unit is an oscillating tone that increases in volume 

 as an object is detected. This method of detection is adequate and allows for a reasonable 

 reaction time. However, the headphones are cumbersome and the sound may become muffled 

 if the headphones are worn over a hood. 



White's PI-1000 



FAIR. This unit has a clicking indicator that changes clicking speed as an object is 

 detected. Discernment of the change in clicking rate is fair. However, the headset has only one 

 transducer and is not well balanced. Because of this, the headset is very difficult to keep from 

 sliding off the user's head. The sound may also become muffled if the headset is worn over a 

 hood. 



Fisher Pulse 8 



GOOD. This unit comes with a diver earphone that may be used inside a diver's hood. 

 The earphone indicates the presence of a target by a change in its output tone (higher frequencies 

 indicate increased target strength). 



Forster Ferex 



FAIR. This unit has a clicking indicator that changes clicking speed as an object is 

 detected. Discernment of the change in clicking rate is rated as fair. 



GENERAL HANDLING 



Garrett XL500 



FAIR. The handle design and weight distribution is good for supporting this unit. 

 However, the wand length is adjusted by adding either one or two extension rods that are 

 connected together by nuts and bolts. This type of fastening arrangement is not well suited for 

 quick adjustment to wand lengths, particularly in a small boat or by divers in the water. The 

 parts of the fasteners are also likely to become lost. 



White's PI-1000 



GOOD. The handle design and weight distribution is good for use in handling this unit. 

 In addition, the length of the wand is easily adjusted by means of a telescoping mechanism on 

 the wand. The rod uses compressive pins that lock into holes on the outer tube. Since no tools 

 are required for adjustment, varying the length can be done easily on land, boat, or in the water. 



B-2 



