The values are as low as the dealer thinks he can get it for. NADA is a good place to start. Be realistic. No one cares if it was your Dad's boat or it has been in the family for years with countless fishing trips, memories, etc. Any knowledgeable private buyer is going to want an independent inspection from an independent shop along with a compression test and inspection on the motor.
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner