Randy Cowley Yacht Consultants

1988 Delta Marine 70

  • 70 ft
  • Trawler
  • Seattle, WA, US

Price :

  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70
  • 1988 Delta Marine 70





Basic Information

Delta Marine
Seattle, WA, US
Available for sale in U.S. waters:
Vessel Name:
Boat Type:
Hull Material:
Hull Type:
Hull Color:
Delta Marine
Flag of Registry:

Dimensions & Weight

70 ft - 21.34 meter
70 ft - 21.34 meter
20 ft - 6.1 meter
Draft - max:
10 ft 6 in - 3.2 meter
Bridge Clearance:
42 ft - 12.8 meter
Dry Weight:


Cruise Speed:
10 MPH
5294 MI
Joystick Control:
Engine Type:
Drive Type:
Fuel Type:
455 (Individual), 455 (combined)
Max Speed:
13 MPH

Tank Capacities

Fuel Tank:
4600 gallons - 1 tank(s)
Fresh Water Tank:
900 gallons - 1 tank(s)
Holding Tank:


Total Cabins:
Total Berths:
Total Sleeps:
Total Heads:
Captains Cabin:
Crew Cabins:
Crew Berths:
Crew Sleeps:
Crew Heads:



Full specifications

Sea Lion is accessed from an aft deck door into the salon; a portside door (aligned with the portside boarding gate) into the salon; or doors from the boat deck on either side of the pilot house into the pilot house.


The salon is carpeted wall-to-wall. To starboard there is a custom-built shaped 6'10" built couch with hidden, built-in storage compartments under the cushions. The couch is fronted by two ottoman/coffee tables. To port is a wall of custom cabinetry to window height that contains the audio/visual control equipment, a built-in electrically lowerable wide-screen TV, book cases, and a built-in fold down custom chess/checker table. Two large over-stuffed custom chairs flank the TV.

The audio/visual equipment is as follows:

  • Samsung 6050 40" LED Flat-Screen TV
  • Dolby HD Direct TV Receiver
  • Samsung Blu-Ray disc Player
  • Geffen 4x1 HD Switch with Audio De-Coding
  • Parasound Zone Amplifier
  • Sonos Player 120


Forward of the salon is the dining area with a teak floor and a beautiful, custom, wenge, leafed dining table expandable to accommodate 8 diners. There are 8 matching chairs, 3 of which can be positioned at the galley counter for informal meals.


The galley is forward of the dining area, separated from it by a wide granite counter top. The galley is u-shaped with an over-sized sink with garbage disposal on the starboard wall, and with the stove/oven and full-height refrigerator and matching freezer on the forward bulkhead. The dishwasher, trash compactor, and extensive drawer storage open into the galley from under the counter between the galley and the dining area. Across from the galley on the portside wall is a large service counter with the same over-sized sink with garbage disposal for cleaning crabs and fileting fish. On the service counter aft of the sink is a coffee bar with both an expresso machine and a Nespresso machine. Forward of the sink is a 52-bottle wine cooler. Under the service counter is a high-capacity ice maker, a beverage refrigerator and cabinet, and drawer storage.

Appliance List (All new in 2011):

  • GE Monogram 30" Stainless Steel Gas (Propane) Stove Top
  • Electric Propane Shut-off Switch in Galley with Properly Vented Storage for Two 5-gallon Tanks
  • GE Monogram Convection Oven
  • KitchenAid Microwave
  • Liebherr Full-Height Up-Right Refrigerator
  • Liebherr Full-Height Up-Right Freezer
  • GE Monogram Dishwasher
  • GE Monogram Trash Compactor
  • GE Monogram 52-Bottle Wine Reserve (in Service Area)
  • U-Line Ice Maker (in Service Area)
  • U-Line Ice Beverage Refrigerator (in Service Area)
  • Cuisinart Expresso Maker and Nespresso Expresso Maker
  • Krupps Drip Coffee Maker
  • Bruell 4-Slice Toaster
  • Breull Toaster Oven
  • Cuisinart 14-Cup Food Processor
  • All-Clad 7-Quart Slow Cooker
  • KitchenAid Blender 


The laundry room is at the bottom of the stairway leading from the galley/service Area down to the lower deck. The laundry room contains an LG washer and an LG Dryer. It also contains two 40-gallon hot water heaters, the hot water circulation pump, suction pump for the Newtone built-in vacuum system (with plug-ins throughout the boat) and control panel for the intramural phone system. 


The Master stateroom is entered from the aisle between the service counter and the galley on the port side. The Master has a queen berth, three full height custom hanging lockers and ample drawer storage, all cedar-lined. It also has ample under-the-bed drawer storage (limited to non-metallic objects due to presence of flux-gate compass under the bed). It has a built-in desk on the starboard bulkhead with an Aeron chair. Forward of the bed is the doorway into the ensuite bath with granite counter tops, granite lined custom shower and Head Hunter head.

The master stateroom has its own entertainment center including:

  • Samsung 6000 30" LEF Flat-Screen TV
  • Dolby HD Direct TV Receiver
  • Samsung Blu-Ray Disc Player
  • Sonos Player 120
  • Networked Brother printer


The pilothouse is full-width with teak flooring and a wall-to-wall control station. Two pedestal-mounted Stidd leather helm chairs sit behind the control panel. Behind the helm chairs is a large, built-in, leather-upholstered settee with surround bench seating for six people. The table is polished burl and has two suspendable leaves that, in the down position, create two separate tables with a walk-way in between to allow easy access to the center of the bench seating behind the table. There is a 6'8" pilot berth up behind the settee.


  • One panel-mounted Furuno GMDSS FM-8500 Radiotelephone
  • Two overhead-mounted ICOM 602/604 VHF radios
  • Three handheld ICOM M-36 submersible VHF radios
  • Three Eartec voice-activated headphones with mic
  • EPIRB ACR 406 Cat 1 (attached to aft control station outside on boat deck

Internet Access:

  • KVH V7 Satellite Communications System
  • Wireless router with Verizon wireless card

GPS Receivers, Compasses, Plotters and Autopilot:

  • Saab R4 GPS receiver
  • Saab R4 AIS Class A Shipboard Transponder
  • Ritchie Magnetic Compass in binnacle
  • Furuno GP 37 GPS Receiver with Furuno SC-50 Satellite Compass
  • Furuno GP 37 GPS Receiver (Back-up)
  • Dual networked Dell computers, each with Nobeltec Odyssey plotting software
  • Simrad AP50 Autopilot with steering lever, rudder angle indictor and 24-volt Acusteer steering pump 

Radar/Sonar/Depth Sounder:

  • Wesmar Sonar
  • Furuno 2117 Radar w/AIS
  • Furuno Navnet with 1933CBB Radar and ETR-6/10N Depth Sounder 

Information Systems:

  • Analog engine instruments
  • Maretron information and alarm system with high water alarms on all five bilges, and smoke/gas alarms throughout boat; also anemometer and depth read-outs, tank levels (black/gray water, fresh water, fuel, waste oil), engine and electrical system performance read-outs
  • Floscan fuel consumption meter
  • Elbex camera system with 4 cameras: mast pointing forward; mast pointing aft, aft deck pointing to portside trap hauler/down rigger stations; engine room

 Lights and Horn:

  • mast-mounted strobe light
  • mast wing-mounted LED lights (both port and starboard) for docking, boarding
  • Six mast-mounted 1,000 watt Aqua Signal halogen flood lights, two facing forward, four facing aft
  • two deck-mounted (on aft corners of Boat Deck) 500 watt Aqua Signal halogen flood lights
  • commercial grade running lights (long range visibility)
  • remote controlled 120-volt search light (mounted on hard-top)
  • Kallenberg commercial air horn with various automatic signal settings 


  • clock and barometer
  • trolling valve
  • transmission disconnect valve to allow increasing RPMs (for more hydraulic power) without turning the propeller
  • multi-speed, multi-mode wiper controls
  • 4-Panasonic phones hru ship intercom
  • networked Brother printer on bridge

All of the critical nav/comm equipment normally operated on 120 volts can be powered by a MasterVolt sine wave inverter located under the pilot house command station. The pilot house has its own 12-volt and 24-volt gel cell batteries each with a dedicated charger. In the event of flooding in the engine room, these power sources will enable continued operation of the boat's radios and emergency lights. If necessary, the batteries may be paralleled with the engine start and/or house batteries. Any of the batteries on board may be charged by three different sources. This configuration exceeds the Coast Guard requirements for inspected vessels.


The flying bridge is both a command center and a social center. It has three control stations: a centerline helm and two wing stations, port and starboard. Two white leather Stidd command chairs are mounted behind the centerline station. The centerline command station has a plotter screen and the necessary thruster and engine controls to steer the boat.

The Stidd chairs can be turned to face aft, becoming part of a seating area that is completed by a wrap-around, built-in, well-upholstered bench and integrated high-gloss teak cocktail table. The bench provides built-in storage which contains 6 survival suits.

The flying bridge sits under a permanent fiberglass Bimini hardtop custom built by C-Fab in Newport Beach, CA. It supports isinglass curtains all around with zippered closures and roll-up tabs.


 The Lower Deck is accessed via a stairway on the port-side of the galley. The Lower Deck has a single bunk crew quarters in the bow with a separate entry door and also a door into an adjoining bath. This bath also has another door into the captain's cabin just aft and on the starboard side. The captain's cabin has a separate entry into the hallway that runs the length of the lower deck. Across this hallway from separate entry into the captain's cabin is the doorway into the Laundry Room. If the Owner is captaining the boat, the crew quarters and the captain's cabin on the lower deck will serve as very comfortable additional guest staterooms.

Just aft of the laundry room door is the stairway up to the galley and the main deck.

Further aft off the lower deck hallway are two guest staterooms, one to the port and one to the starboard. Both are ensuite with full baths including showers and Head Hunter heads. The port-side stateroom has two single beds. The starboard-side stateroom has one double bed. Each stateroom has a hanging locker and generous under-bed drawer storage as well as built in night stands and shelf storage.


Aft of the two guest stateroom doorways is a water-tight door into the engine room. It is possible to enter and exit the lower deck through the engine Room and via a ladderway on the aft bulkhead of the engine room leading up to the aft deck.

The engine room contains:

  • main engine, a turbo-aspirated Cat 3408 with only 3,400 hours since major overhaul in 2002
  • power take-off on main engine to drive bow thruster
  • engine-driven air compressor
  • alternator to charge main engine starting batteries
  • control panel for 5 float-activated bilge pumps, one in each bilge
  • battery isolation switches for main engine starting batteries and "house" batteries
  • fuel tank distribution panel
  • main two-buss electrical panel with power source selector switches for each buss
  • two AutoShore power boosters feeding the shore power into the electrical panel
  • stainless steel work bench with built-in sink and top mounted stainless steel vise
  • two MagnaSine 4,000 watt inverter chargers
  • air drying system for Kobelt pneumatic shifter
  • two Technicold 3-ton chillers
  • pneumatic lube oil hose on reel connected to reserve lube oil tank in lazarette
  • bilge pump manifold with suction from all five bilges plus the bulbous bow via either main engine-driven mechanical bilge pump or 2½ HP 24-volt electric bilge pump with priming from the sea chest
  • sea chest with dual inlets (either side of keel aft) and a distribution manifold to generators, water makers, ballast pump (bulbous bow), HVAC pump, bilge pump manifold prime, and the main engine
  • pump table with engine room bilge pump, two fresh water pumps, ballast pump, HVAC pump and fresh water filtration system
  • Reverso oil change pump for all three engines and transmission connected to waste oil tank
  • fuel filtration panel with Racor filters for main engine and both generators
  • two 30KW Northern Lights generators in sound shield housings each with less than 1,400 hours
  • generator starting battery isolation switches
  • power take-off on forward generator to drive hydraulics pump for anchor winch and stern thruster
  • oil cooler for Naid stabiizers
  • oil tank for hydraulic system
  • fuel manifold
  • fuel level sight glasses for main (engine room saddle) tanks
  • sea strainers for main engine, generators, HVAC pump, watermakers


  • Twin Disc 516 gear 5:05:1 ratio
  • dripless 3.75" stainless steel propeller shaft
  • 46" Propeller
  • 8 blade 18", 50HP bow thruster
  • 14 blade 18". 35 HP stern thruster
  • 18" Bow and stern thrusters by American Thrusters
  • Niad stabilizers 16 square feet
  • fore and aft bilge keels, port and starboard
  • Fillable bow bulb for head sea ballast with dedicated electric pump


Hydraulic power for the anchor, thrusters and stabilizers is provided from two independent hydraulic pumps, one driven by a power take-off on the main engine and the other driven by a power take-off on the forward generator. A hydraulic oil reservoir with tank-mounted filtration is located on the starboard side of the forward bulkhead in the engine room. Controls are located on the overhead switch panel in the pilot house. There is enough hydraulic power to operate the bow and stern thrusters simultaneously.

HVAC System

The boat has two Technicold 36,000 BTU (3-ton) chillers with programmable SMVector Lenze variable frequency drivers. These units can be run together (in tropical or sub-tropical environments) or one-at-a-time. They cool a loop that passes through Acqua Air air handlers in each stateroom, the galley, the dining area, the salon and the pilothouse.

The air handlers can be easily (and individually) re-programmed to control electric heat coils in each air handler so that individual living spaces can be electrically heated while the rest of the boat is cooled by the air conditioning.

The boat also has a Kabola diesel furnace (in the lazarette) that heats the air conditioning loop (if the chillers are not in use.) This provides non-electric, highly efficient heat to all the living spaces as well as non-electric heat to the hot water heaters.


The boat's electrical system is designed for self-sufficiency and overnight anchorage without running a

The boat has a 24 six-volt AGM deep cycle batteries connected in parallel which gives the "house" battery bank 2,490 Amp-Hours of current at 24 volts. In addition, it has two 4,000 watt MagnaSine inverter/chargers that enable the conversion of battery bank's 24 volts to 120-volts for appliance use. With a generator on, or connected to shore power, the MagnaSines switch automatically to charging mode and replenish the "house" battery bank.

The boat has two 30 KW Northern Light generators either one of which running alone is sufficient to power all the boat's electrical demands, even with clothes dryer, the convection oven, the refrigerator, the freezers and the air conditioner running simultaneously.

The boat has two 50-Amp shore power leads, on the bow and one on the stern, each with a 100-foot cable. Each cable is extended and retracted automatically by means of its own Glendenning Cable Master. Each cable connects to its down isolation transformer which then feeds into its own Comar Electric AutoShore 50 Amp/ 120V-240V power booster.

The boat also has two Phase 3 battery chargers, one for the main engine starting batteries and one for the generator starting batteries.

  • 2 Northern Lights Lugger 30KW generators: #1 w/1392 hours; #2 with 1394 hours (7/14/14)
  • 12-volt and 24-volt DC systems
  • 120/240-volt AC systems at 60 hertz
  • DC & AC distribution panels
  • Gel cell house batteries totaling 2400 amp hours (new in 2011)
  • two 4,000 watt MagnaSine inverter/chargers (new in 2011)
  • two shore power isolation transformers and two AutoShore power boosters
  • Glendenning cablemasters fore and aft each with 100-foot 50-amp cable
  • two Phase Three battery chargers, one of main engine starting batteries and one for generator starting batteries
  • main engine-driven 300 amp 24-volt alternator controlled by Ample Power regulator to charge main engine starting batteries


Sea Lion's lazarette and freezer hold occupy space which, on the fish boats that were once built in this hull form, contained large fish storage tanks and freezers. On Sea Lion, these spaces provide commodious storage.

The freezer hold hatch and the two outboard lazarette hatches each have a hydraulic ram which permits their opening and closing hydraulically at the flip of a toggle switch. The center lazarette hatch must be opened and closed by rotating the permanently mounted aft deck dining table.

In addition to all the storage, these spaces also house the following equipment and appliances:

  • hydraulic steering pump
  • hydraulic power pack for deck crane
  • 24 volt electric air compressor (back up for main engine air compressor)
  • two 450-gallon fresh water tanks
  • two FCI Max Q1,800 GPD reverse osmosis watermakers with filtration system
  • Frigidaire chest freezer
  • reserve lube oil tank
  • Halon fire suppressant tankKobala diesel furnace


Aft Deck:

  • moveable isinglass curtains that enclose entire aft deck
  • de-mountable electric trap hauler
  • de-mountable down-riggers port and starboard
  • Halon 1301 auto release with engine room fuel and ventilation shutdown
  • fresh water faucet with integrated retractable hose-on-reel in aft deck cabinet
  • custom Corian-topped, permanently mounted dining table with seating for 8
  • Corian countertops on aft deck cabinet tops
  • sink with hot and cold fresh water
  • hose bib with hot and cold fresh water
  • heated hanging locker (for drying rain gear)
  • warping winches port and starboard
  • articulated hydraulic swim step that can be lowered to water level to facilitate tender boarding and man-overboard recovery.

Boat Deck:

  • MarQuip 2500-pound single cable davit
  • 3 large on-deck mounted storage boxes (on boat deck)
  • Aft control station on boat deck
  • Custom Kayak SS rack w/3 sea kayaks (new in 2011)
  • 17' Boston Whaler Montauk w/90 hp Mercury (new in 2011)
  • 13' AB RIB w/40 Honda OB
  • life jackets and safety equipment, man overboard sling, flares
  • vented propane tank cabinet with two five-gallon tanks
  • portable gas-powered bilge pump/fire suppressor w/50' hose
  • ship's bell
  • hinged mast: 24' down; 39' up

Fore Deck:

  • Portuguese bridge
  • Hydraulic on-deck anchor winch built by Delta with 350-pound Tacow SS anchor backed by one shot of 3/4" chain and 600' 6X19 SS cable
  • Bow warping winch
  • Fresh and salt-water hose bibs
  • 8 person life raft

 The boat also carries a full set of nylon snap-in-place window covers for all weather deck windows. The boat carries aluminum storm covers for the portlights.


The Delta 70 is the iconic trawler yacht. Its hull form is that used by Delta Marine to build 70-foot Alaskan crabbers. Zoepilote(today, Tatu). Built in the early 1980's for renowned yachtsman Bruce Kessler, was the first Delta 70. It was Delta's first yacht. Prior to Zoepilote, Delta exclusively built fishing boats for the Alaskan fishery. After Zoepilote, only four more Delta 70s were built, including Thunder (now, Sea Lion). The last was Oasis, built for Cliff Rome. After Oasis, Delta built larger and larger yachts and today is acknowledged by many to be the finest yacht builder in America.

With her Alaskan crabber, full-keel, hull (6" thick at the turn of the bilge), with a 12' skeg designed to support the weight of the boat sitting on the bottom, Sea Lion has proven sea keeping ability, and with her large fuel capacity, power generating capacity and water making capacity, she has inter-continental range and expedition self-sustainability.

Sea Lion's interior has been transformed into a beautiful and fully functional living space. The finest materials and the best craftsmen were used to give her a feeling of comfort, warmth and durability throughout. The refit covered mechanical, personal features and systems but also made her more liveable. The enclosed aft deck is a gathering space, a space where you can interact with guests and watch the cruise as you travel. The flybridge is also another area that is fully designed for viewing your travels. Sea Lion is a small ship that can go anywhere and take her owner and guests there in safety and comfort.

At 70 feet, with a 10½ foot draft, Sea Lion is roomier than many boats half her length. Yet she is just small enough so that she can be owner-operated, and just large enough to justify a one- or two-person crew.

AS she lies today, she is fully found, and ready to sail to any destination in the world, or to cruise leisurely up the Inside Passage. She is a truly unique trawler yacht.

For more in depth information refer to www.mvsealion.com.

Company Disclaimer

All speeds, measurements, capacities, consumptions, etc. may be approximate or estimated.  Specifications provided for information only.  Data was obtained from sources believed to be reliable and is not guaranteed by owner or brokers.  Buyer assumes the responsibility to ascertain the correctness of all data contained herein and otherwise provided and must instruct his agent and surveyors to confirm all details for accuracy prior to purchase.  Subject to prior sale, price and inventory change, or withdrawal from market without notice.

Default Disclaimer

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.


External Links

Watch Video:

  • SEA LION 70' Delta Marine



Presented by :

Randy Cowley Yacht Consultants
Seattle, WA
Roche Harbor, WA, US
Disclaimer: The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his/her agents, or his/her surveyors, to instigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.(6711199)