For the one-hundred eighth edition of the GeoGearHeads John Robb returns to talk about lasers and geocaching. On his fourth appearance, John Robb (of who caches under ) shares some of the issues to consider when attempting a laser-based geocache, advantages, disadvantages, and some examples. John's first laser cache was "" () which lead him and his partner to create "" (). So other example laser caches are "" () and "" (). He also provided the "" page for helping calculate errors. A couple of caches created with their are "" () and "" (). Thanks to and for their audio feedback used in this episode. Congratulations to for submitting the winning answer for this week's question. Thanks to for their donation of this week's gift! The live video session from this Google+ Hangout On Air can be found on .

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