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    This survey reviews hands-free haptic devices for walking navigation. Current devices, while promising, require significant improvements in localization accuracy before aiding visually impaired individuals.

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    Area of Science:

    • Human-Computer Interaction
    • Assistive Technology
    • Robotics

    Background:

    • Navigation guidance for pedestrians is crucial for mobility.
    • Haptic feedback offers a non-visual modality for conveying spatial information.
    • Hands-free devices aim to integrate navigation seamlessly into daily activities.

    Purpose of the Study:

    • To provide a comprehensive overview of hands-free haptic devices for walking navigation.
    • To categorize and discuss existing devices based on body placement.
    • To evaluate the current state and readiness of these technologies.

    Main Methods:

    • Systematic review and categorization of hands-free haptic navigation devices.
    • Discussion of devices by body part (arm, foot, leg, back, belly, shoulders, waist, head).
    • Creation of a comparative table rating aspects like autonomy, conspicuity, and compactness.

    Main Results:

    • Devices for outdoor navigation demonstrate higher technology readiness due to GPS integration.
    • Highly compact devices often lack autonomy, requiring experimenter assistance (Wizard of Oz).
    • Experimental tests showed success in reaching targets, but with varied requirements and autonomy levels.

    Conclusions:

    • No current hands-free haptic navigation devices are sufficiently advanced for use by people with visual impairments.
    • Localization accuracy is the primary limiting factor, needing consistent high precision.
    • Outdoor navigation devices show the most promise, but overall readiness for widespread assistive use is limited.