The best replacement for bad elf is garmin glo.

The best alternatives to bad elf are rated as following:
★★★★★  garmin glo
★★★  xgps150
★★★  dual xgps150
★★  dual gps
★  emprum
  gns 5870
  ultimate gps

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Speaking about bad elf, one probably shouldn't forget about foreflight.

Other search terms related to bad elf and their ratings are:
★★★★★ foreflight
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bad elf
garmin glo
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