DEVICE FOR EVALUATING PRECISION OF DETERMINATION OF LOCATION OF CONTROL POINT AT SPORTS-TOPOGRAPHIC MAP Russian patent published in 1994 - IPC

FIELD: methods of control and training when getting one's bearings. SUBSTANCE: device has case 1 provided with cap 2 attached by hinge, panel made of ferromagnetic material in form of mesh 3 for fixing holders 4 at any point of the panel. Mash 3 has current conducting evaluating rings 5-7 mounted concentrically and insulated one from another. Control unit has power unit 9, illuminated call-out 10-12 and needle-prod 13; all units are connected electrically by means of wiring 8. Needle-prod 13 is mounted into magnetic holder 14 with its sharp end up and mounted movable onto metal base on the bottom of case 1. Mesh 3 is covered with opaque flexible material which may be punched without any force applied and connected to cap 2 by hinge. Transparent protecting film is located above the bottom of the case for placing sports-topographic map under the film. Metal base 15 is spring-loaded by a spring against the lower part of case 1. Surfaces of magnetic holders 4 and 14 turned one to the other have like-pole fields. Magnetic holder 4 is electrically connected with current-conducting target 7. EFFECT: widened functional capabilities; improved convenience. 2 cl, 2 dwg