Established in 1984, Custom Offshore specializes in the preparation of racing and performance cruising yachts. Services include consulting, full electronics and electrical system design, installation and programming and the design and implementation of AC and DC electrical power distribution and management systems, including high capacity lithium-ion battery systems.

Custom Offshore is one of the leading electronic dealers for Simrad, B&G, Expedition software, Mastervolt and C-Zone. Other brands include KVH, Maretron, Balmar, Garmin, Icom, Fusion, Sirius XM, Globalstar and Panasonic Toughbook.

Prior to concentrating on electronic and electrical systems services, for 31 years Custom Offshore operated a renowned boatyard. A J-Boat dealer for 28 years, Custom Offshore also handled brokerage sales of a wide variety of performance sail boats.

Custom boat shop work included advanced blade and bottom faring/templating, deck hardware and rigging layout and installation, custom built rudders and keel grids, laminate work, blister repair and prevention, core rehab and other refinishing work. Custom Offshore worked in composite construction including vacuum bagging, pre-preg and cored laminates.

Over the decades Custom Offshore has been a leader in race prep for many winning boats including J35, IMS, IRC, Mumm 30, Farr 40, Corel 45 and even Americas Cup yachts. They have also worked with top designers including Bruce Farr and Associates, Nelson Marek, Gregg Stewart, German and Manny Frers, Bill Tripp and Mark Mills and with some of the top boatyards/builders including, NEB, Goetz, Carroll Marine, Nautor Swan, David Noyes in New Zealand and many others.

Members of American Boat and Yacht Council.


Jeffrey Udell, has spent his entire 46 year career in the marine industry, 35 of them as co-owner of Custom Offshore Yachts, Inc.

Jeff holds national championship wins as skipper in the GP-14 and Mumm/Farr 30 classes and at the J35 North Americans. He has crewed on a vast array of winning yachts over the years including 12 Metres, TP 52s, schooners, and Gunboat performance catamarans. Other regatta wins include Block Island Race Week and American Yacht Club and Annapolis Yacht Club spring and fall series.


Known for his customer service and attention to detail, Jonathan’s extensive knowledge regarding the sailing industry is a key quality that has made Custom Offshore one of the leading performance offshore specialists.

Jonathan has decades of experience sailing J24s and along with Jeffrey Udell has campaigned J22s, J27s, J29s, J35s and Mumm/Farr 30s.