Grant Wentworth - Nantucket Sound

Pt Gammon (Cape Cod) to Great Point (Nantucket)

18.6 miles (29.9 km)

12 hours, 0 minutes on July 24, 2015

Observed and documented by Paul McQueeney


  • Name: Grant Wentworth
  • Age on swim date: 28
  • Nationality: United States

Support Personnel

  • Escort Vessels & Pilots
    • 25ft Boston Whaler Guardian, piloted by John Boreland.
    • 35ft custom Scopinich, piloted by Tom Harty.
  • Navigator: Ron Kramer
  • Observer: Paul McQueeney
  • Coach: Chloe McCardel
  • Kayakers: Mark Wentworth, Matt Evans, Brian Ebke, Scott Arcenas.
  • Shark Divers: Andy Olday, Blake Knowles, Chris Jankins.
  • Other Crew: Janel Jorgenson McArdle.

Swim Parameters

Route Definition

Crossing of Nantucket Sound from Cape Cod to Nantucket Island.

  • Start: Point Gammon, Great Island, West Yarmouth (Cape Cod)
  • Finish: Great Point (Nantucket)
  • Certified Route Distance: 18.6 miles (29.9 km).

Historical Background

Second-ever swim of Nantucket Sound, after Paul Asmuth (1986). First swim in this direction (Cape Cod to Nantucket).


MSF Rules of Marathon Swimming, without exception or modification.

Swim Data

  • Start: July 24, 2015, 04:25:12.
  • Finish: July 24, 2015. 16:26:06.
  • Elapsed: 12 hours, 0 minutes, 54 seconds.

GPS Track

Frequency: 30 minutes. Download raw data (CSV).

Observer Log

Download PDF (5.8 MB)


Note: the official (straight-line) route distance is 18.6 miles, not 25 as stated in the video.

Click to enlarge

Other Supporting Data

Media Coverage

Selected Swim Resume

  • 2014 English Channel Relay.
  • 26.5k Long Pond Swim in Mount Desert, ME. 16.5k
  • Nantucket Harbor Swim.
  • 3x Town of Nantucket - Wauwinet 10k.
  • 3x Alcatraz Swims.
  • Swim Across America Boston Harbor Swim. 1.5 mile
  • Bill Reeve Echo Lake Swim.
  • 1-mile Swim Across America Nantucket.
  • 1-mile Hudson River Swim for Life.
  • 1k NYCSWIM Brooklyn Bridge Swim.