Is a GPSMAP 64st w/City Navigator card a workable nuvi substitute?
Recently retired and just upgraded from an iPhone to a 64st for geocaching. I was wondering if adding a City Navigator map chip means the 64st can be used similar to my nuvi 2557 for highway/city driving. A smaller screen and no voice I understand, but is this pairing practical? When flying it would mean taking only one device and if I am switching back and forth over and over between driving and walking is a GPSMAP w/sd card good at turn by turn in a moving vehicle? I found nuvi reception and battery life stinks in surroundings like NYC. Is this the intended use of the city chip?