What do people with dyscalculia struggle with? What skills are necessary to be a competent surveyor? Is #1 not listed in #2?
Surveying
Dyscalculia is a learning disability in math. People with dyscalculia have trouble with math at many levels.  Surveyors work with elements of geometry, trigonometry, regression analysis, physics, engineering, metrology, programming languages, and the law.  Geometry and trigonometry are types of advanced mathematics.
The technique, profession, and science of determining the positions of points and the distances and angles between them
Would you hire someone with dyscalculia to do surveying work?