The Club has use of a 25 yard indoor range under the Queen Elizabeth Way road bridge in the north of Cambridge.
If you happen to be one of the many rowers then the bridge will be familiar to you as the big road bridge downstream of the boathouses. If you prefer to stay in bed in the morning then the map below should show you where you need to go.
The range is inside the bridge, access is by a silver coloured door on the north side of the river. On the guest days there will be someone there to open the door for you, but at other times you must let someone know you're coming if you want to get in!

The map is taken from the University of Cambridge Official Map, and is still under their copyright. They also have a larger scale map here if you're not sure which part of Cambridge the map shows.