Verse 1:

D5 min       C5
my heart has lost its wind now
F5        G5
broken like a dead sail
D7min       C5             F5     G5
my love has drifted out to sea
D7min   C5
my body has been claimed
F5          G5
soul has been shipped away
D7min          C5              F5
can't feel the sand between my toes

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G5           C5      F5
that's where we went wrong

BflatMaj          BflatMin.
we were young and learning,
F5         D7min
steady hearts hate turning
G5           C5      F5
that's where we went wrong

Verse 2:

D5 min     C5
my will to fight has been flushed
F5              G5
seized like blank babies faces
D5 min    C5             F5    G5
the water line begins to rise
D5           C5
let the tide swallow me whole
F5         G5
like morning light in windows
D5            C5            F5
let that dark water take me home

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G5           C5      F5
that's where we went wrong
BflatMaj          BflatMin.
we were young and learning,
F5         D7min
steady hearts hate turning
G5           C5      F5
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:
         D5       C5
(greta:) hey come back to me
          F5     G5
(darren:) hey come back to me
         D5       C5
(greta:) hey come back to me
          F5             G5
(darren:) baby come back to me
                ...etc.

Chorus:

BflatMaj   BflatMin.    Fmaj       D7min
we set the wrong course and headed due north
G5           C5      F5
that's where we went wrong
BflatMaj          BflatMin.
we were young and learning,
F5         D7min
steady hearts hate turning
G5           C5      F5
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.