G'day gto49, welcome to GPSPower.

You haven't actually stated the history of the gmap version map's use and which unit it's unlock codes are for. You can only 'own' an unlock code for one unit. The two possible scenarios:

  • If the computer installed map was not purchased for the GW Navi and it has been unlocked for another Garmin unit then it won't be made available to any other unit even though it can be sent to a media card. That's because the unlock and gma codes are exclusively for the previous unit and so the map will not work if the card's used in a different unit.
  • If however you did unlock it in BaseCamp/MapInstall specifically for the GW Navi's UID then this may indicate that Garmin has tightened up control of using any other maps apart from those they supply on CF cards together with the firmware updates, completely regardless of the other maps being purchased legally. I think that's an unlikely possibility because of their legal responsibility to prominently warn of any such restriction, but if that's the case you may have grounds for a refund despite the length of time since purchase.