Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_99 ( geohash_length INTEGER, lat_error VARCHAR, lat_bits VARCHAR )

### Question ###
What is the highest geohash length when the lat error is 0.00068, and the lat bits larger than 17?

### Accurate SQL ###

SELECT MAX(geohash_length) FROM table_name_99 WHERE lat_error = "±0.00068" AND lat_bits > 17