Best way to value a boat for sale?

[Mako19]

What is the best way to determine a fair value for a boat?

Will be selling a Mako 19' Deep V 1996 hull with a 2001 150hp 2 - stroke Yamaha outboard. Motor serviced annually by Montauk's father who is a professional Yamaha mechanic. Compression good on all cylinders. Every time any mechanic works on this motor they comment how clean this motor is.

Motor has NEVER left us on the water. I trust it enough to take this boat 40 miles offshore without a buddy boat. See my old fishing reports.

Tandem axle Aluminum trailer in decent shape. Bearings changed last year but needs 2 new tires pretty soon.

Boat has an aluminium T-top where stereo and VHF radio are mounted.

I have no idea how to come up with a fair asking price. Any advice is appreciated.