Lowrance electronic LMS-337C DF - Manual (Page 67)

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Free training emulator is available for your unit on our web site.
The emulator works exactly like your real sonar/GPS unit. Using the
Sonar Simulator and GPS Simulator features, it allows you to play
back sonar logs, run GPS routes and trails and create real waypoints
you can use in the field! You can even take snapshots of the Sonar
Chart and print them or e-mail them to friends.