Good sea time?

Just got a sea time letter from a previous employer. It lists days underway for when I worke some shipyards as well as a factory. Do these even count? Factory workers do work outside, help with lines etc etc but I thought it was more a matter of position title?

Boat GRT:765

Position: Near Coastal, being sea, gulf of Alaska

Deckhand on F/V: 199 days underway, 16 hour days

Factory on F/V: 244 days underway, 16 hour days

Shipyard work on F/V: 96 days underway, does not specify hours