Cognitive Accessibility Research Modules - Technology Assisted Indoor Navigation / Wayfinding

This module looks at cognitive accessibility issues that may arise when using technology-assisted navigation through indoor spaces, also known as wayfinding. This paper includes discussion on geolocation and directions from place to place. Wayfinding refers to the ability to navigate to a desired location and back again. Wayfinding means people can orient themselves, explore, and navigate through buildings such as museums, hospitals, airports, and public transportation stations. Wayfinding is separate from outdoor navigation, such as via global positioning systems (GPS), primarily because GPS does not function inside buildings.

This research module addresses technology-assisted navigation, or wayfinding, within indoor environments for people with disabilities that require cognitive accessibility support. It explores concepts such as geolocation and directional guidance from one point to another.

Wayfinding, in this context, refers to the ability to successfully navigate to a desired location and return. This encompasses orienting oneself, exploring, and moving through various indoor spaces like museums, hospitals, airports, and public transportation hubs.

An example use case would be:

• Upon entering a large hospital with multiple in-patient and out-patient departments, a user must navigate to their primary care appointment. The user enters their destination into a digital kiosk at the entrance and receives customized directions. In addition, they receive information on how to access a public webpage with an adaptive 3-D map from their smartphone. The webpage that hosts the map also contains information about different areas of the hospital and what services they provide as well as adjustable preferences [RC-upadhyay1]
• A user constructs a grocery list by identifying the aisle number and location of each item and then ordering their list to move through the store with clear directions from one item to the next [RC-antonakos1].
• A user is planning a trip that has a short layover in a large, busy airport. The user is able to utilize the airport’s wayfinding app to plot out their connection gates with an estimated travel time [RC-nas1].

This module focuses on explaining the issues that lead to diverse user needs impacting web accessibility. For this reason, it may sometimes address a broader scope than web accessibility alone. Digitally assisted wayfinding sits at the intersection of the digital and physical environments. While there may be solutions in the physical space, our focus here is on digital approaches.

Wayfinding can produce a wide range of challenges for people with cognitive disabilities. Not all people with cognitive abilities will have difficulties with wayfinding. Some people may experience temporary cognitive issues with wayfinding due medication side-effects, mental health status, or other factors. High demands to cognitive load, negative experiences in wayfinding, and interruptions can impact both the cognitive and physical energy a person can put towards wayfinding. Issues with wayfinding can occur for people with impairments including those that impact:

• memory,
• executive function (the brain’s ability to plan, focus, remember, and manage tasks and emotions),
• attention,
• visuo-spatial function,
• language
• perception processing/interpretation, and/or
• knowledge acquisition, retention, or recall.

Below are some ideas that might help meet the user needs above. Note that digital solutions should also meet [WCAG21] and [coga-usable]. Also, this module focuses on explaining the issues that lead to diverse user needs impacting web accessibility. For this reason, it may sometimes address a broader scope than web accessibility alone.

Inform user of time to destination up front. Provide real-time information about time to travel to destinations along any available routes.

Integrate landmark-based navigation . Maps and directions should integrate easily recognizable landmarks that provide additional help with wayfinding. These should integrate photographs of these landmarks rather than abstract representations, birds-eye view or reliance on cardinal (north / south) or body-relative (left and right) directions. Where possible, allow users to customize routes with their own landmarks.

Include both digital and environmental solutions. Include physical wayfinding aids (e.g. signs, directional arrows, color-coded pathways) as well as digital aids.

Provide multiple methods for accessing directions . For example, provide step-by-step directions that are provided in text,audio/video, and a map with a directional overlay such as an arrow that also provides spoken directions.

Present directions in smallest steps possible . Each step-by-step direction should be a single action (i.e. continue straight; turn left, etc). Avoid providing too much information at one time.

Provide real-time directions. Provide each step in the moment it is needed with sufficient time for the user to react.

Provide textual information in clear, concrete language.

• Use clear language for all written or verbal instructions.
• Avoid abstract, complex, or specialized language in directions and guidance.

Provide photographs of decision-points .

• When a user needs to make an adjustment in their course (i.e. turning), providing a user-level photograph of that point in the route.
• Avoid using more than one type of visual representation (e.g. do not use both photographs and drawings)

Avoid changing routes without user approval . Proposed route changes should only be implemented if the user is made aware and approves. Users should be made aware of differences in the proposed route such as more steps.

Provide methods to always access directions . For example, instead of relying only on static kiosks, have methods for users to be able to revisit directions at any time, especially while they are moving through the route. Include ways to personalize the indication (i.e. rather than a static map, include adaptive instructions that change as the person re-orients themselves). Due to the complexity of access, QR codes are not recommended.

Allow personalization of interface. Users should have control over options like color contrast, text size and font, and sound. This limits distractions and/or increases usability based on their individual needs.

Allow multiple modes of input. Users should be able to input their desired destination in multiple ways, including typing, speech, and selecting on a map.

Allow personalization of terms including directions and measurements . Allow users to customize key terms such as distance measurements.

Provide human back-up. Allow users to contact human support when wayfinding fails. For example, an interactive map of a hospital could have an option to call the front desk integrated into its interface. An additional off-line way to reverse course is also helpful, if the wayfinding and general internet fails. Note this could also be a back up when no service is available to devices - in that case no option to call the front desk would be available.

There has been some attention to indoor wayfinding for people with cognitive disabilities in the academic literature, and a number of prototypes assisting in wayfinding have been developed. While a small number of technologies for cognitive assistance in wayfinding are available on the market, most attention has been devoted to outdoor navigation or public transit. Determining a person’s location and obstacles indoors remains challenging, making technologies that provide accurate real-time location information difficult to develop. Some technologies currently being deployed to address these issues include Bluetooth beacons, magnetic fingerprints, WiFi fingerprints, RFID tags, ultra wideband (UWB), and ultrasound.