Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_89 (capacity INTEGER, navigator VARCHAR)
### Question:
What is the average capacity for the vehicle having a navigator of Macneall?
### Answer:
SELECT AVG(capacity) FROM table_name_89 WHERE navigator = "macneall"