Hey Cliff,
Cabelas has the Garmin Striker 4 portable on sale for $230.00. I just picked one up at CT for $300.00 so it is a good deal. Haven't used it yet, but planning on taking it on all my northern trips.
https://www.cabelas.ca/product/134498/garmin-striker-4-portable-bundle
im going to disagree about going with a 5 because a 5 in a boat feels very very small. I personally believe that you are best to get something that is dual purpose to get more bang for your buck. You wont regret getting a unit that doubles up as a GPS that has autochart functionality and doubles as an ice unit.
I brought my helix 7 up with me to Capreol and spent my time autocharting around our fishing holes and it allowed for us to dial in our stuff much more effectively. I didnt find it to be a burdon at all, it still fit in my Ice unit bag.
Just a heads up here.
There are restrictions on moving fire wood form certain areas to others. I have no idea what the fines are but I know it wont be cheap? Here's the contact info for the Canadian Food Inspection Agency (CFIA) they are the agency in charge of the ash bore issue.
CFIA Contact
A phone call doesn't cost you anything.
Dan...