NavList:

Starting at the top we have

1. A replica cross staff made for HKMM by New England based replica instrument maker Gregg Germain

2. The Thaxter sextant correctly identified by Sean C, but c.1860s (from evidence on the case)

3. What the Museum’s caption wrongly identifies as a Troughton Repeating circle, c.1805 (after more research I tried to get the database and caption changed but was told there wasn’t time - it is actually a rare example of 4. Troughton’s three armed reflecting circle (it couldn’t repeat), a sort of circular sextant that Troughton was convinced (but no one else was, was a perfect answer to problems of scale making error - then Jesse Ramsden came along; beautiful other examples at http://americanhistory.si.edu/collections/search/object/nmah_1197876; http://www.bbc.co.uk/ahistoryoftheworld/objects/PPaYiwueRfmdur-3Tg3tQA; and http://collections.rmg.co.uk/collections/objects/42283.html - good exploded diagram (of a sorts) of how it was put together at http://www.ssplprints.com/image/106896/lowry-w-troughtons-reflecting-circle-1817) 

5. An early 19th century octant by Frodsham & Keen, Liverpool

6. The Davis Backstaff, no maker identified, is an 18th century example

7. Kelvin Hughes sextant (No. 67830. date 13.11.68) belonged to my late brother-in-law, a Shell Tankers master

8. 6.5” radius Plath micrometer, No.10340 made 1935

9. Tucked over in back barely visible, a Heath & Co, ‘Bell’ frame sextant, c.1910, that had belonged to Lt Cmdr CWA Baldwin RN

On the case bottom:

10. 1990s Magellan handheld GPS310 that I used to own

11. 19th century Islamic quadrant (primarily for religious orientation and date confirmation, not position finding purposes)

12. Trimble 4000 GPS from the 1990s (S/N: 3033A01077 A)  

13. 1838 artificial horizon by Thomas Jones with glass and brass cover, mercury tray, ivory mercury bottle and box     

Hope that helps.

Best,

Stephen D