Modifying for Emergency TX
 

I am trying to get a two'fer and wondering if it's possible. I need
to get a VHF marine radio for boating use on Lake Erie, for weather
reports and so on. It would be nice to be able to listen to
shortwave, etc. in a single, waterproof package. I was wondering if
it is possible to modify a Yaesu vx-7r or 5r to reliably transmit on
marine frequencies in emergency situations.

Thanks

John