You need to install the map in Mapsource and then transfer it to the 176C from Mapsource.
I suppose the 176C is like my old 176 (greyscale without C) and needs to transfer the data by a serial cable. If your computer does not have a serial port there are usb to serial adapters for a reasonable price avalible.
The 176C can not handle NT-maps I believe but maybe the waterways map is not an NT so it should work well.
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