What are the primary designated functions of Marine VHF Channel 16 (156.800 MHz) and Channel 70 (156.525 MHz)?

1. Channel 16 is the international radiotelephony distress, safety, and calling channel; Channel 70 is exclusively dedicated to automated Digital Selective Calling (DSC / Llamada Selectiva Digital)
2. Channel 16 is for private commercial phone calls; Channel 70 is for recreational music broadcasts
3. Channel 16 is used only by naval submarines; Channel 70 is used only by lighthouses
4. Channel 16 is for harbor radar transmissions; Channel 70 is for satellite television