Some competitors wear the extra control description sheet in a holder strapped onto their forearm, so that they can read it while running. Each competitor is required to carry a control card, and to present it at the Start and hand it in at the Finish. The control card is marked by some means at each control point to show that the competitor has completed the course correctly. In both trail orienteering and North American style mounted orienteering, it may not be feasible, safe, or permitted for the competitor to go to the control point itself. Instead, the competitor views the control point from a short distance and marks the control card with a pen. Several marking schemes are in use, including a pre-printed multiple choice form, and a "secret word" posted at the control point that the competitor must copy down. In foot orienteering, the oldest form of orienteering, the first control cards were card stock with a perforated stub, the stub to be handed in at the Start as a safety check. At each control, originally, the control staff or the competitor rubber stamped the control card using a rubber stamp and inkpad kept at that control. Rubber stamps soon were replaced with ticket punches, usually with a different punch shape (circular, square, diamond, star, etc.) at each control. Card stock control cards are in limited use today, having been mostly replaced by weatherproof stock such as Tyvek. Ticket punches have been replaced by needle punches that punch a pattern of small holes in the control card (similar to a perfin). Weatherproof stock and needle punches are being replaced with electronic punch systems. The orienteer carries a small electronic control card that is a memory card encased in plastic and provided with a strap to attach to the finger. At each control point, and at the Start and Finish too, the orienteer inserts the card into a battery-operated station. There are two principal types of these, SPORTIdent and EMIT although newer technologies are starting to emerge using RFID wristbands timing or QR barcode timing such as iOrienteering. The SPORTIdent control card is a small plastic stick ("e-card" or "e-punch', also "dibber" and "fingerstick"). The EMIT control card is a larger, card-shaped stick with a built-in backup feature: a small paper card inside the control card is pierced by a pin in a specific location at each station. In both electronic punch systems, the control code (number) and punch time at each control point are recorded on the card.