Navtour's website:  https://www.navtours.com/en/destinations/lake-champlain/

Please also view these magazine articles, which provide itinerary suggestions for your charter time on Lake Champlain: 

https://newengland.com/yankee-magazine/travel/vermont/burlington/slow-boat-big-lake/

http://www.sailmagazine.com/charter/destinations-charter/a-lake-champlain-charter/