I don't believe so. Since Humminbird announced the new VX line of mapping and withdrew the FishSmart App, I don't believe the individual lakes are available for download. If you already have individual lakes on the FishSmart App or your unit, you can continue to use them, but I don't think additional ones can be downloaded. Also, if you have the FishSmart App and loose it, through phone change or accidental deletion, you can't replace it.
The new VX line is definitely purchase by region on the graphs but, you can do a yearly subscription of $24.99 on the new One-Boat Network App and you get the entire VX mapping for the US and Canada on your mobile device. The mapping on your mobile device can't be transferred to the Helix/Solix/Apex... They are totally separate at this point.