I copied and pasted the US_GarminLakes_Full.img file to the sd card as follows: "sd\Garmin\Map\", as per instructions on this thread. ~ It did not show up in my Garmin 40.
Where did you read this above? "sd\Garmin\Map\" is wrong. Maps naming depends on devices. Nuvi 40 uses Map/anyname.img , outdoors (those supporting this map posted here) use Garmin/gmapsupp.img or Garmin/anyname.img: same as Basecamp
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