iGuidance. Would changing the baud rate lower be better? At 5hz, Garmin does look smoother but you can still see choppiness and it still jumps when I make a turn. iGuidance still updates at 1hz even when it's being fed 5hz. iGuidance 4 that is..
Oh, and this thing locks position incredibly fast compared to previous units like my Holux GM-210. Resuming from hibernation is more than enough time for the unit to get a lock.