What are the limitations on Moagu maps?
There’s a bunch – there’s a section in the help file that lists them all. Initial display speed is probably the biggest issue, but once a Moagu map is displayed, it will keep up with your current position at walking speeds, and for some maps (like USGS topo maps), even at bicycling or slow driving speeds. See this review at GPS Tracklog for actual results with mountain biking, and you’ll see that Moagu maps are definitely field-friendly. So don’t judge it by the initial display speed – take it out for a walk, or a bike ride, and see how well the display updates your position. Maps created by the BMap2MP utility are much faster in display and updating, but have fewer colors than Moagu maps (62 vs. 254), and may have other level display issues.