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Model profile · for Great Loop buyers
Navigator 4800 CLASSIC
The published record on this model and what owners report, with the
questions worth asking while a boat is still a listing. This page covers the model.
Every boat still needs its own homework.
A quiet-riding motoryacht, built from the late 1990s into the late 2000s, that has completed the Loop. Price Volvo parts and servicing along your route, and measure the flybridge/arch air draft.
The Navigator 4800 Classic is a flybridge motoryacht from Navigator Yachts (founded 1988 by the Marshall family of Californian yacht fame), built from the late 1990s into the late 2000s. Sea magazine's 2003 sea trial described the brand as known for quiet operation, a soft ride, useable power and enviable fuel economy. Verifiable model-specific data is thinner than for mainstream trawlers, so several points below are framed as questions to confirm on the specific hull. As a Loop platform it has real-world precedent (at least two 4800 Classics have completed the Great Loop), but engine variant, fuel capacity, and air draft all vary by hull and must be verified. Twin Volvo Penta diesels are common in this family (Series 63 on the earlier hulls, Volvo D6s on later ones), but treat the engine fit as hull-specific: before committing, find out exactly which engines this boat carries, who services them along your route, and what parts actually cost. A listing won't tell you, and all three vary more than the brand does.
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Where the listings disagree
Published numbers for this model don't agree. Settle these on the
boat you're looking at before they cost you.
QUESTION
What is this hull's actual fuel capacity: 500, 550, 600, or an optional 750 gal?
Listings show fuel capacity varying by hull: 1999 at 550 gal, 2003 at 500 gal, 2000 at 550 gal, with an optional 750-gal setup reported by one owner. A 2007 listing shows 600 gal. Confirm the tankage on the specific boat since it drives range.
src:
YachtX; YachtBuyer; Calibre; Boatered; Denison listing (2007)
How to read the tags on this page.
FACTdocumented, with the source named
PATTERNtwo independent sources agree; confirm it on the boat you're looking at
CLAIMstated by one source, not yet confirmed
QUESTIONopen, and settled by looking at the boat itself
CONTEXTbackground on how this model is built or used
Sources are linked where published.
Builder status
QUESTION
Is Navigator still producing, and what factory support exists?
Navigator Yachts, which also built Californian, was sold to a private equity group at the end of 2012 and the founding Marshall family exited. It continued building 45–68' semi-custom yachts in Perris, California, but the entity now appears registered to an Oregon address associated with a hardware company. Current production status could not be established, so we don't assert one. For a used-boat buyer the practical question is parts and factory support, not whether new hulls are being laid.
src:
The Log; Trade Only Today (2012 sale)
Your move: Ask the broker, or a Navigator owners' group, what factory or aftermarket support currently exists.
Engine checks (Volvo TAMD63 family)
PATTERN
Wastegates and raw-water pumps are the known wear points on the TAMD63
On the Volvo TAMD63 family that powers the earlier boats, owners in two separate Yachting Monthly forum threads (2019 and 2021) name the same weak spots: turbo wastegates that "rust shut or open if not looked after or have very little use," raw-water pumps (a factory change "from a single to a double bearing," and drive gears "prone to wear"), and intercoolers that "can get gummed up." These owners weren't on Navigators; this is the engine family.
src:
Yachting Monthly (YBW) forum threads on the TAMD63, 2019 and 2021
Your move: Ask the Volvo mechanic to check the wastegates, the raw-water pump drive and the intercoolers, and ask when the pumps were last rebuilt.
Range & cruising
FACT
Measured on plane: about 22 gph at 17 knots
Sea magazine's 2003 test boat, with the standard 318 hp Volvos, burned about 22 gallons per hour at about 17 knots and 2,300 rpm, and about 33 gph at top speed. The magazine lists 0.8 mpg and a 400-mile range at 20 mph, and 72 dBA at cruise. It was tested on a calm late-summer day, so treat these as best-case numbers.
src:
Sea magazine sea trial, Dec 2003 (scan hosted by Navigator Yachts)
CONTEXT
Power ratings vary by year: read the engine plates
Standard power was twin 318 hp Volvo Pentas, with 370 hp optional, per Sea magazine's 2003 test. Later boats moved to Volvo D6s, and listings show ratings from about 310 to 370 hp, so read the engine plates, because speed and burn depend on them. Sea's test boat ran from 6.6 kt at 1,000 rpm to about 21 kt wide open at 2,800 rpm. For the Loop you'll run displacement speeds, where the ~7.5 gph figure applies.
src:
Sea magazine sea trial, Dec 2003 (scan hosted by Navigator Yachts); Denison and YachtBuyer listings (2007, Volvo D6)
Air draft
PATTERN
Flybridge with radar arch: measure air draft and identify what lowers
This is a flybridge boat with a radar arch and antennas, so it tends to sit high. The PowerBoat Guide lists no clearance for the 4800 Classic; one broker listing for a 1999 boat gives 17'1" of bridge clearance without saying what's up or down. Prior owners may have added radar or antennas that raise it, so take your own measurement and identify what can be lowered (arch, antennas). At least two 4800 Classics have completed the Loop, so it can be brought under fixed bridges with prep, but confirm the measured number yourself.
src:
Curtis Stokes listing (1999 Sea Change); PowerBoat Guide sheet (Navigator Yachts); Seattle Yachts listings; Trawler Forum
FACT
The builder publishes 16'9" above the waterline
Navigator's own 4800 spec page lists a height above the waterline of 16'9", about 4 inches under the 17'1" a 1999 listing gives. It doesn't say whether that includes the radar arch, which Sea magazine lists as standard equipment, or the antennas, and the same page lists Yanmar engines, so it may describe a later build.
src:
Navigator Yachts 4800 specifications; Sea magazine sea trial, Dec 2003 (scan hosted by Navigator Yachts)
Your move: Measure the boat you're looking at, with everything up.
Systems
QUESTION
Age and condition of the air-conditioning units: any replaced together?
A 4800 owner replaced all four AC units after they failed within 24 months of each other (suspected running in shallow sandy water), calling it his only large unexpected expense. Ask the age and service history of the AC compressors and pumps.
src:
Boatered
CONTEXT
Navigator built its own tanks, so inspect aluminum fuel tanks for age
Navigator fabricated their own FRP water and waste tanks and their own aluminum fuel tanks; the 1999 listing confirms aluminum fuel tanks. That is generally viewed positively, but on a boat this age have the aluminum tanks inspected for pitting/corrosion.
src:
Trawler Forum
Reading the boat
CONTEXT
Loop precedent exists, but verify each hull individually
Navigator Yachts descends from the Californian line (Marshall family, founded 1988) and Sea magazine's 2003 test described the brand as known for a soft ride and fuel economy. At least one 1999 is marketed as Great Loop capable and a 2001 completed the Loop in late 2024. That's real precedent, but engine variant, tankage, and air draft still vary hull-to-hull and must be checked.
src:
Curtis Stokes; Seattle Yachts listings; The Hull Truth
Livability
CLAIM
Does she have an inverter, or does the generator run to keep the fridge cold?
The owners of a 2003 4800 found no inverter section on the boat's AC panel, so on their first leg they ran the generator around the clock to keep things like the refrigerator running. They later installed lithium batteries and two inverters so they could anchor without it.
src:
Mathers on the Map, "We Upgraded Our Boat's Electrical System For The Great Loop!" (YouTube)
Your move: Check the AC panel for an inverter section, and ask what runs at anchor with the generator off.
Engines
The engines research is part of the full profile inside the
product. It covers factory options, tested performance and the engine-specific
questions in our members' dossiers, and it travels with every dossier and survey brief
built on this model.
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