I ended up buying the following from
www.manventureoutpost.com:
ACR WW-3 Survival Whistle (2228) 10020CW 1 $2.57 USD $2.57 USD
Dry Pak VHF Radio Case (DP-512) 27234CW 1 $19.69 USD $19.69 USD
Standard Horizon HX850s Handheld VHF w/GPS (HX850S) 32135CW 1 $139.71 USD $139.71 USD
Items: $161.97 USD
Shipping Cost: $16.64 USD
Total Cost: $178.61 USD
I basically bought what Christian suggested. I really like the idea of having a simple emergency button that sends an SOS message to the coastguards with your GPS location.