Verse 1:

D7 min       C7
my heart has lost its wind now
F        G7
broken like a dead sail
D7min       C7             F     G7
my love has drifted out to sea
D7min   C7
my body has been claimed
F          G7
soul has been shipped away
D7min          C7              F
can't feel the sand between my toes

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G7           C7      F
that's where we went wrong

BflatMaj          BflatMin.
we were young and learning,
F         D7min
steady hearts hate turning
G7           C7      F
that's where we went wrong

Verse 2:

D7 min     C7
my will to fight has been flushed
F              G7
seized like blank babies faces
D7 min    C7             F    G7
the water line begins to rise
D7           C7
let the tide swallow me whole
F         G7
like morning light in windows
D7            C7            F
let that dark water take me home

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G7           C7      F
that's where we went wrong
BflatMaj          BflatMin.
we were young and learning,
F         D7min
steady hearts hate turning
G7           C7      F
that's where we went wrong

Bridge"

I play the bridge part with this twice:
E----------------------------------------------------- | 
B----------------------------------------------------- | 
G---------5---57-------------------------------------- | 
D---3---57------5---57-------------------------------- | 
A-35------------------5-(2nd time through, add a -43-- |  to end of this)
E----------------------------------------------------- | 

Then just play the verse chords with this part. Like so:
         D7       C7
(greta:) hey come back to me
          F     G7
(darren:) hey come back to me
         D7       C7
(greta:) hey come back to me
          F             G7
(darren:) baby come back to me
                ...etc.

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G7           C7      F
that's where we went wrong
BflatMaj          BflatMin.
we were young and learning,
F         D7min
steady hearts hate turning
G7           C7      F
that's where we went wrong

I highly suggest going to Youtube.com and searching "where we went wrong".
You can watch the acoustic version of this and play along for practice.