Joe Zemaitis and John Zemaitis - Round-Trip Angel Island

Counter-clockwise loop around Angel Island from Aquatic Park

16.1 km (10.0 miles)

5 hours, 54 minutes on 10 September 2020

Observed and documented by Lisa Amorao


Name Gender Age Nation Resides
Joe Zemaitis male 40 United States Scottsdale, Ariz.
John Zemaitis male 37 United States Scottsdale, Ariz.

Support Personnel

  • Stephanie Mindlin - crew chief
  • Mylan Trang - boat captain
  • Lisa Amorao - observer / photography

Escort Vessel: Tango (Hyde Street Marina)

Swim Parameters

  • Category: Tandem solo, nonstop, unassisted.
  • Rules: MSF Rules of Marathon Swimming, without exception or modification.
  • Equipment used: Both swimmers: textile swimsuit, swim cap, goggles. Joe wore a simple wristwatch.

Route Definition

Start @ Aquatic Park beach just west of Dolphin Club dock, exit through Aquatic Park opening, counter-clockwise around Angel Island, return to Aquatic Park beach via Opening.

  • Body of Water: San Francisco Bay
  • Route Type: island loop
  • Start & Finish Location: Aquatic Park beach, just west of Dolphin Club dock. (37.808074, -122.42165)
  • Minimum Route Distance: 16.1 km (10.0 miles) (map).


LongSwimsDB: Round-Trip Angel Island

Swim Data

  • Start: 10 September 2020, 07:19:00 (America/Los_Angeles, UTC-7).
  • Finish: 10 September 2020, 13:03:03
  • Elapsed: 5 hours, 54 minutes, 3 seconds.

Summary of Conditions

Feature Min Max
Water Temp (F) 62 63
Air Temp (F) 59 67
Wind (knots) calm 6

GPS Track

Trackpoint frequency: 10 minutes. Download raw data (CSV).

Speed Plot

Nutrition: Carbo Pro every 30 minutes. Occasional GU.

Observer Report

Download PDF


Click to enlarge.