Create a New Forum Admin Login Member Login Contribute to Voyager Search VoyForums Help Desk VoyForums Exchange VoyForums Directory/Categories VoyForums Homepage VoyForums News FAQ - Frequently Asked Questions

[ Show ]

Support VoyForums

[ Shrink ]

VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time ]

Subject: GPS Receiver Data Surveying Author: Capt.Dr.Ivica Tijardovic [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 07:48:09 03/01/06 Wed Hi, In last 8 years as a Shipmaster I have visited more than 150 vessels and have found about 30 different types of GPS receivers, but none of them calculated the Rhumbline Distance accurately. I found 7 GPS methods of Distance calculation and three of them were Rhumbline Distance methods. If GPS receiver doesn't give the True Rhumbline Distance, then GPS receiver information (except the GPS position) is not correct, like distance, course, etc. Of course, differences, e.g. in distances are small, but not insignificant: between Miami and Charleston 2 N.miles, between San Francisco and SE Australia more than 15 N.miles, between Philippine and Panama more than 40 N.miles. Whoever has a GPS receiver may use simple Tables from my book (Differences in GPS Rhumbline Distances) to see how much the GPS Distance differs from the True Rhumbline Distance. The price of the book is US$50.00 including packing and postage expenses. Brown's Nautical Almanac (www.skipper.co.uk) has plenty information about this topic. I believe it has come time for GPS Receiver Data Surveying. Captain Doctor Ivica Tijardovic, Shipmaster and International Professional of the year 2005 ivica.tijardovic@st.t-com.hr [ Next Thread | Previous Thread | Next Message | Previous Message ]