Recent content by zvidoron

Re: WP store GPS works internally on WGS84. If you take the coordiantes of a waypoint from a Euro 1950 chart and enter them to the unit after setting it to this datum, the correct geographical position will be recorded. If you are 10 miles west of that point, the range and bearing to it will...

Thinking about it now after a good night sleep the answer is actually very simple - enter a waypoint with the GPS set to one datum, say Eu 1950, using round lat and long, i.e. N 51 00.000 and W 005 00.000 then switch to Eu 1979 and read the lat and long. All waypoint are kept in the memory as...

Hello, I am defining GPS waypoints on Admiralty Channel Islands Charts. The 1:150,000 chart (2669) says clearly that the datum is European Datum (1950) but the three 1:50,000 charts (3654,3655 and 3659) only say European Datum without a year. My Garmin GPS has two options for European datums -...

Hear hear !! <hr width=100% size=1>

You can get second hand Davis 15 for as little as £15 pounds, just keep your eys open. From a stable platform I easily got psitions within 2.5 miles of GPS position. Repeatability was also good - 8 or 12 readings all within 1 mile span. <hr width=100% size=1>

Hi, Price not bad at all. Get the Sextan Handbook by Bruce Bauer (not expensive) it will teach you how to adjust it to get best results. With stars your second method is better, you can also turn the sextant upside down, aim at the star and bring the horizon to it. the turn it back, adjust and...

Hello, I recently purchased a Mk IXA Bubble extant in excellent condition. Everything works and is very clean and rust free. However, it appears that some of the liquid had evaporated from the bubble chamber so that there is always a very large bubble in view. I followed all the original...

Try www.oziexplorer.com the basic program is free shareware and is brilliant. <hr width=100% size=1>

This is a wonderful thread I read every entry and really enjoyed myself! An excellent book to read is David Burch's (Starpath school of navigation, USA) "Emergncy Navigation". It is full of excellent advice on how to navigate without various items and with nothing at all. His best piece of...

http://pollux.nss.nima.mil/pubs/pubs_j_apn_sections.html?rid=187 Here you will find the 2002 version - even better! <hr width=100% size=1>

Thanks Tom for that, As the other half involved in this project, could you please leave me a PM with your email I would like to ask you more specific questions about IT job prospects etc. Kind regards Zvi <hr width=100% size=1>

Thanks for that. The edge of lake, or a shoreline from a boat for that matter, was just an example of being able to take a sight knowing that the water line you bring the sun down to is closer than the natural horizon would be for your height of eye. In misty conditions I think if you take the...

In weather conditions like we had in the last few weeks - bright sunshine but misty horizons - what can be done to improve the accuracy of sun sights? It appears that the mist causes the horizon to appear closer and lower than the true horizon, the correction for dip is based on height of eye...

Going next month on a West Scotland marina tour looking for a place to keep a 26' sailing boat. Two areas will be looked at - from inner Clyde all the way down to Troon, and from Oban all the way down to Crinan canal. All in all some 12 marinas. The plan is to buy a house nearby and work...

The new Garmin GPS 72 is worth considering. It is much cheaper, but still retain many of the useful functions of the 76. <hr width=100% size=1>