Re: garmin 1350 on the water ?
Link to upgrade maps to marine--
https://buy.garmin.com/shop/buymaps.do
As mentioned...it will work simply by bringing it with you on the boat. I've used a Garmin car GPS as my boat's speedo, compass, hour meter, odometer, etc. and it's great.
My favorite function is when you touch the speedometer reading on the map screen and it takes you to a new screen that shows max mph, avg mph, total miles travelled, total running time, and more.
It will show a big blue area but no contours unless you buy a marine upgrade for about $100.
I'm considering buying the Michigan marine upgrade for my Garmin, it bascally turns it into a marine GPS for far less cost than a pre-packaged unit.
The only downside is that they do not have the best method for attaching to a boat. I lost an olde unit last summer in the depths of Lake Huron in some 3-4' waves when the suction cup let go from the pounding.
I will be devising a method to keep it onboard when I bring my new one on the boat.
