...
After they cross the finish line, she stops the race and saves it. The boat goes back to land and Victoria talks to Coach Jeff about the piece. They pull up the data and run through it in real time, listening to what Victoria says and taking note on how it affects the different numbers (split, stroke rate, accelerometer readings, etc). They decide that she should say "Let's take 10 strokes for MIT!" more often, especially near the middle third of the race, which is where the acceleration readings on the boat were lowest. Victoria sends the data to Jeff so that he can review it in more depth tomorrow morning on his copy of iCoxBox or on a computer.
Design 1: 
Main opening screen. From here, Victoria can choose an existing race, or start a new one 
screen 1:
learnability: all affordances on the screen
efficiency: tapping is quick and easy
visibility: login state is visible on button and below, number of saved races/trails you have is visible
Err: nothing is irreversible
This is the create a new race screen. She is able to enter the title of the race and adjust each of the items in the menu at will by a direct manipulation drag and drop. From here she can start the race. When she does, the thumbs disappear and the interface is locked-in and recording data. 
screen 2:
learn: affordances for dragging, deleting
eff: all things on screen, no dropdowns, quick and easy modifications
vis: all initial data bars are visible, and this is the look of the screen for when you start a race. bad things: ghost trail is hidden unless you are changing it. can't change audio from here (it's in settings)
err: nothing gets deleted, and movements can always be reversed
Before she can follow a ghost trail, she must select it. This is the screen that appears when she clicks on the inside of the "Follow Ghost" UI element. She can accept her choice or cancel to return to the race recording screen. 
screen 3:
learn: choosing ghost trail shows in map.
eff: scrolling through list could be tedious with lots
vis: check mark next to chosen trail and previous
err: can come back in and rechoose if necessary
Screen 4 is the same as screen three, but in Race mode, where the interface is locked and displaying real-time data.
screen 4:
learn: only two buttons, everything else is static
eff: you shouldn't be editing anything,
vis: any data not on the first screen is hidden unless you scroll, which most likely wont be done in a race
err: shouldnt be interacting unless you want to end a race, but race ending is final.
To save a race after it has been run. This appears when she stops the recording. 
screen 5:
learn: modal interface shows that you can only edit race name
eff: if you want to just use the default and go on, you still need to use this view
vis: previously entered race name is shown to user
err: can always change name later
Once races have been saved, when she selects a saved race, this window appears, displaying the data about the race, and she or the coach can playback the race. 
screen 6:
learn: affordances for places you can view mroe information
eff:
vis: all data for the race visible on one screen
err: only editing feature here is changing the title, which is reversible.
This is essentially identical to the real-time recording screen, but it is playing back a saved race.
screen 7:
learn: HUD displays playback controls, screen is a copy of the data view while racing which is easy to learn
eff: no way to view graphs of data while realtime playback is occurring, so you might need to go back and forth
vis: controls always overlay screen, which allows you to see controls but they could block some data until you scroll down.
err: you can scrub to any place, so errors are reversible
After watching the race on her iphone, she can send the data to her coach or another coxen or rower by clicking the share button in Screen 6, bringing her to this dialog.
screen 8:
learn: only a few controls, each labelled appropriately. shows size of data
eff: all on one screen
vis: checkmark by what you are including. size of file changes to report those changes
err: can readd things you remove, once you hit send you can cancel the sending of the file. you can always restart this dialog from the review races screen
Design 2:
Design 3:
Home Screen (#1):
...