Navigator
Living Legend
The 450 has has the physical characteristics of the 550 but not all of the features, plus apparently a few less accessories.
I am an old open ocean celestial navigator who still laments the technology of GPS, thus I still resist buying one. Perhaps I am still of the generation of the character in Edward Abbey's novel, The Brave Cowboy, which was the basis for the movie Lonely Are the Brave. Perhaps time and technology has overtaken me and I'll just stick to my maps. Yes, I think I will. I'll spend the price of a GPS on gas and motel rooms.
I am an old open ocean celestial navigator who still laments the technology of GPS, thus I still resist buying one. Perhaps I am still of the generation of the character in Edward Abbey's novel, The Brave Cowboy, which was the basis for the movie Lonely Are the Brave. Perhaps time and technology has overtaken me and I'll just stick to my maps. Yes, I think I will. I'll spend the price of a GPS on gas and motel rooms.