I also have 60CSx, very nice for virtually unlimited and automated logging. But it's screen is small and graphics poor compared to newer units (Zumo). I don't complain too much as I like to use paper maps as well for better overview of region and for walking away 60 is nice smaller size.
With this unit you don't need separate data logger and the GPS itself will be always logging to microSD card, separatly from you day logs, if set up that way.
But dedicated logger may be also good. I have one in my car, in hidden position. So it basically will switch on when engine is running and data can be downloaded over Bluetooth after the trip or when required. Also can double as wireless Bluetooth GPS for laptop in and around car. For bike you'll need to find hidden and weatherproof location for it, it can be done. But 2 different units on bike is probably a bit too much.
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