You probably already have MapSource on your computer to use with your 60Csx so a better choice for off roading would be nRoute. It will work with your GPS and use maps you have assuming they are already available in MapSource.
Ibycus Topo will work with Mobile PC and nRoute and, I assume, your 60Csx but is not routable. Topo Canada which is routable, is in a newer format and will not work with nRoute unless you convert it. There is a program to do that, MapReverseConverter, but you must email the author and request a copy.
You might want to look at BackRoad Mapbooks as well. It's a little pricey but probably has more routable backroads on Vancouver Island than Topo Canada. Most features for it will work with your Csx and nRoute although the recommended devices are the Oregon and Dakota.
Vancouver Island BC-SD card [978-1-897225-81-3*] - $69.95 : Backroad Mapbooks, Fishing Mapbooks, Recreation Maps, TOPO Maps
If this interests you, make sure to talk to the retailer about a copy for MapSource and nRoute.
BTW, if you are considering 'upgrading' your Csx for an Oregon, I might be interested in buying your 60Csx.
Terry