Can Virtualpower be used for outdoors workouts

Simple question, I don’t have a power meter but I’d like to do outside workouts before my country is covered under a foot of snow. Can I do so with garmin speed 2 sensors and a cadence sensor, or do I need an actual power meter?

Thanks

edit: Thanks for your answers

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No virtual power outside (since based on turbo trainer) but can use RPE outdoors

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Outdoor speed is too decoupled from power due to wind/aero and hills.

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No, because virtual power relies on constant resistance applied to the wheel.

If you’re coasting downhill and backpedaling, virtual power will think you’re putting in effort.

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