[Psml] Alternatives to GPS

[C. Henry Depew]

Greetings!
      The June, 2009 issue of Power and Motoryacht carried an article 
on pages 26-27 about the re-development of the Russian 
satellite-navigation system (GLONASS).   This system could be 
available for us with the addition of an antenna and/or software to 
our existing equipment.  Or, one might soon see units on the market 
with both capabilities.  On another note, the June, 2009 issue of 
BoatingWorld Magazine carried a short item on E-loran on page 22.  If 
your existing unit is NMEA 0183 compatible, you can purchase an 
antenna that will read both the GPS and E-loran signals.  Now, would 
it not be nice for a unit that reads all three signals and gives you 
the "best solution" for the unit's location?  Then, there are the 
alternatives being developed by the European Union and, of course, 
the LORAN-C option.

C. Henry Depew
Crystal River