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_53871 ( "Ship" text, "Built" real, "Entered service" real, "Route" text, "Gross tonnage" text, "Length" text, "Width" text, "Passengers" real, "Vessels" real, "Knots" real )

### Question ###
How many knots did the Ms Moby Vincent have when passengers was less than 1.6?

### Accurate SQL ###

SELECT COUNT("Knots") FROM table_53871 WHERE "Ship" = 'ms moby vincent' AND "Passengers" < '1.6'