Garmin 305 training techniques:

6 Min @ 90+% HR max intervals, followed by a 2 min rest. 6 reps. The initial step, and the final step allow me to ride to the workout area (15 mi or so) and return home, all in one "Activity"

Selelct the workout when you start the ride.
1. Press Start (this starts the timer, and lets you ride as much or as little as you want. It says "No Target" but this step is waiting for me to hit 90% hr max. One of the display windows shows BPS needed to reach 90% so I can keep it down until I'm ready.

2. Do the following for 6 reps:
A) Ride in zone 5 (90 - 100% max hr) for 6 min.
B) Rest for 2 min
C) Ride until HR hits Zone 5 again
D) Repeat step 2a
3. When workout is over, ride until you Press Stop.