to Laptop, when the main GPS goes south for any reason. I run Coastal Explorer on the laptop,but I think the GPS it will read just fine on Active Captain which is free. The new handheld Standard Horizon floating VHF has GPS built in at about $200 for the unit, as well as a Emergency DSC. We also have older handhelds, just as Paul D. I would go with the new Standard Horizon VHF. Then you have redundancy with the fix mounted radio and GPS, as well.