By Russ, on June 16th, 2008
After the last post I had a few emails asking me what PRN 32 means so I thought I would list a few terms that you may come across if you start looking into the GPS system..
SV – Space Vehicle
PRN – Pseudo Random Noise
NANU – Notice Advisory to Navstar Users – there is a free mail list service run by the US Coast Guard to send GPS watchers an automatic status report.
For the latest nanus see the US Coast guard site here.
BTW its
…….Click GPS Terminology – nanu nanu 
…. to continue reading
By Russ, on June 16th, 2008
There has been some discussion recently about the new satellite PRN32 or at least an old satellite that has been recommissioned and brought into the GPS system.
It appears that some people are claiming that their GPS receivers software has been coded to count the number of satellites it can detect as 31 whereas there are now 32 satellites – I think this is a misunderstanding …I may be wrong!
It is common practice for programmers to count from 0 to 31 (ie.32) or from 1 to 32 (ie 32) when setting registers or creating arrays to handle data. I am pretty
…….Click GPS – New Satellite SOG Errors? …. to continue reading
By Russ, on June 2nd, 2008
I wrote about Mobile XT previously. My comment was not that you couldn’t get chartplotting software on a smartphone, because patently you can – the comment I made was that you couldn’t get Bluechart marine charts to be read by Garmin Mobile XT on a smartphone. After making that post Bob left a comment that he had managed to get his Garmin Mobile XT to read Bluechart charts on his phone – even though this feature was not documented!…
Just to recap,Mobile XT is Garmin’s new GPS app that will be
…….Click Garmin Mobile XT & Bluechart Marine Charts on a phone? …. to continue reading
By Russ, on June 1st, 2008
I thought I would give a quick update on some of the more popular brands of AIS receiver and transponder, including some of the salient comparative features. Prices are approximate of course, when you look at your favourite online store I am sure you could better them – but it was interesting to note the price variations and also the way that features are not always a guide to price.
Maker
Watts
Dual Ch
Notes
Price
RECEIVERS
£
NASA AIS2
0.5
104.95
NASA AIS Radar
0.5
209.95
Easy AIS2
0.9
211.44
Raymarine AIS250
2.4
647.43
Comar AIS2
0.4
Yes
211.57
…….Click AIS Update – does yours have an “anti-pirate” Button? …. to continue reading
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