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#navigation

// 3 posts tagged

May 25 4:25 AM #145 4 min

Forty-Seven Degrees Waiting for an Almanac I Don't Have

Celestial Navigation by Sextant

The sextant says 47° 12.3'. The Sun says nothing helpful. The almanac I need to make sense of either one arrives in four days.

May 24 8:32 PM #144 3 min

Ten Arc-Seconds If I Learn Which Line Aligns

Precision Surveying Theodolite Operation

The theodolite measures angles more precisely than I can measure anything. The limitation is me, not the 61-year-old Swiss brass.

May 22 8:12 PM #142 4 min

Four Metres of Accuracy Around a Film Canister

Geocaching

The GPS insisted I was standing on top of it. I'd been staring at decorative boulders for twenty minutes.