Purchasing A Used Boat In Ontario Garmin ETrex Legend HCx?

Garmin eTrex Legend HCx? - purchasing a used boat in ontario

I chose this device because it seems to meet all my needs. Excursions, boat trips to the unknown small lakes in Ontario, usually a couple of trips to the well-trodden paths, so you rent a car in other countries (Costa Rica, Cuba, etc.) .. I need to know is to make use of this device, I have to buy Mapsource Metro Streets for Canada and Canadian Topomap Mapsource or is the hype? Maps from other sources can use this device? I did not buy the device, but it is a better choice for use in Canada?