If you know your route, you can plan a route with multiple waypoints and put them all in a named signal file, much like the Speed files for a Nuvi. Love my ol' 60CSX because it's one of the most accurate hand-helds I've ever seen, but it does have it's limits. I used it extensively when Geocaching, and often planned routes based on the order I wanted to retrieve the caches. This let me get a cache, get my bearings to the next point, and start walking without looking at the unit again until I got close enough to my next destination to trigger the alarms. The caveat here, though is that you may have varying distances between the targets. If, however you plot your trip in BaseCamp, you might be able to filter a path to finite distances between points, then load that as a GPX on the 60CSx. You're going to need routable trail maps in BaseCamp, though. If you don't have those, but do have existing tracks for where you want to do this, filter one of those an load it as a GPX. I don't know if this will do exactly what you want, but it'll get close.