Cobham River Lodge currently does not furnish depth finders. We do provide detailed lamented fisheries map of our waters. Usually 1 out of 20 guests bring a fish finder. If you plan on purchasing a depth finder for your trip, we suggest buying a inexpensive simple fish finder that preforms basic depth reading. Side scanning sonar are very nice, but really not needed for our waters. If you choose to bring a sonar depth finder, you can download the latest sonar maps of the Cobham River system and Hidden Lake into your sonar unit.