Forums Recent Posts Forums Land Surveying & re... Strictly Surveying Speaking of "Bl... Notifications Clear all Speaking of "Black Boxes" Strictly Surveying Last Post by loyal 9 years ago 1 Posts 1 Users 0 Reactions 12 Views RSS loyal (@loyal) Posts: 3735 Member Topic starter I have had this hanging on my office wall for the last 30-40 years. Although specifically a geophysicist joke, it relates to GPS use by some folks too. :angel:Loyal Posted : March 31, 2016 1:38 pm Share: Tweet Share Share