Originally Posted by AirBoyzT
Is yours mounted at the helm? If so can you hear the anchor alarm inside the cabin from the helm?
The alarm is weak, but there is an external alarm wire built into the power cable. Add a relay and you can run any electrical
external alarm you like. Radio
Shack has plenty for around $10. This feature worked great on my 545. When anchored we would leave the 545 powered in the cockpit
with the external alarm down below.
I also bought a 740s. They are going cheap
right now. I paid less than $700 for mine.
Regarding the 820: If space is at a premium the 820 is 2.7 inches wider and 1.8 inches taller. It does have some nice buttons and I am sure it is has a faster processor.