Don’t have the map be your only format for data display, supplement your map with a table and/or list (i.e. directions/routing, data display, etc.).
Adding an additional format for your content in the form of a table or list provides another resource to blind, and even colorblind users when maps are involved. In this way a larger proportion of your audience can benefit from the content you are displaying, including users who may not be visually impaired at all (helping all audiences visiting your map).
Other Notes:
- When designing navigational tools, offer both "route" and "map" options.
- Remember that people have different ways of orienting themselves and absorbing geographic information, including perceiving space and spatial concepts.
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