Why spend a fortune on one fancy Navigationsystem in the boat and one in the car and one Handheld GPS in the forest and one on your snow-mobile. 

Combine simple available portabel technology in one system for all applications with the same  excellent  practical accuracy  ( same satelites! ). Make your own charts and maps instead of more expensive specialsystems where mapcosts could be high! Most of the equipment can be found and bought on the internet . 

I can support you by good advices and has solutions and support for the beginner or to the more advanced users.  

If you are interested to share my experiences -no question is too small or comprehensive  do not hesitate to send me an E-mail