Near the center top of Lady Heather's main screen are values for PDOP, HDOP, and VDOP. In the pdf manual there is one lonely reference to PDOP and none (that I found) for HDOP and VDOP.In case anyone wants some info on these, here you go:Spoiler alert: according to the article it seems we should be somewhat happy with less than 4 for PDOP. I've been watching to see if there is any correlation between PDOP (and HDOP and VDOP), the DOP line in the graph, and the proximity of the LCD readout to 10 MHz (10,000,000.0000Hz). Only briefly (for a few seconds) have I seen a PDOP slightly over 4, mostly it's in the high 1s to lower 2s, and currently it's 1.97 - and it's 4 zeros to the right of the decimal point in the LCD Hz counter. Oops, PDOP just went to 1.91 (lowest I've seen) but the LCD Hz counter went to .0001 briefly, and then back to .0000.Lowest HDOP I've seen is 1.04 and lowest VDOP is 1.59 - but I've only been watching for about 30 minutes (an hour ago I didn't know these things even existed.) Just hit 1.90 on PDOP but it's very slowly toggling between .0001 Hz and .9999 Hz. I'm guessing the GPS and the OCXO are chasing each other around. Now it's back to .0000 at a PDOP of 1.99. Guess we have some more #s to watch.So within the category of Time Nuts might be a category of PDOP Nuts. I'm thinking there is probably a cure for this or it's just temporary. (until something new to measure comes along)Update: new best #s below but I'm guessing given my limited antenna view that guys with better antennas and much better views of the sky are getting much lower numbers.Update: My bad, should have done a search around here first. Turns out people have been talking about these #s since Dec 2014. But I'm still feeling sort of like Columbus discovering a new land (when people were already living there).Speaking of sailing, time, lat, and long if you haven't seen this it's pretty amazing (not the video quality but the content):