http://www.nkhome.com/rowing-sports/empower-oarlock http://www.nkhome.com/rowing-sports/empower-oarlock This comes from a manufacturer of standard rowing equip

http://www.nkhome.com/rowing-sports/empower-oarlock http://www.nkhome.com/rowing-sports/empower-oarlock This comes from a manufacturer of standard rowing equipment and is priced at a level suitable for small programs or individuals. 2 others that are currently under development: http://www.sweetzpot.com/ http://www.sweetzpot.com/ https://www.kickstarter.com/projects/1605381989/the-rowing-app/description https://www.kickstarter.com/projects/1605381989/the-rowing-a... Both of these use smartphone apps for the UI.