Additionally, if you mean 'Routes' literally as I think you do, sadly no. The 3xxx series has 'Trips' not 'Routes' and they are not the same. You can create them in BC as stated by catymag and send routes to your 3770 where they will be converted to Trips, but you can't do it the other way round i.e. sent your trips created on the unit to BC [or MS for that matter].