Re: How often are the maps updated?
The Harmon RHR (730N) has perhaps annual updates but, from the posts in this forum, the updated maps are two or three years behind what you get for a stand alone Garmin. Doesn't seem to be worth $150. Garmin usually updates their maps quarterly for their stand alone units.
Not sure how its been for the Garmin based 430N.
2011 WK2 Overland Mineral Gray/Black, Advanced warning, V8; 2009 KK Rocky Mtn V6; 2000 WJ Laredo I6; 1979 CJ7 I6... green... miles of smiles :)