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Pros
Pro Save placemarks
Can save placemarks of different types under different lists and hide or show each list. Can be exported to KML files for use in Google Earth, etc.
Pro Records tracks
Records a track of where you've been and shows it on the map. You can hover over the track to see distance and time at each point. Tracks can be exported for import into other software.
Pro Many map types supported
OSM, MapQuest, satellite images, Hike & Bike, etc.
Pro Can use Google Maps
Officially removed at request of Google, but can still be used by manually editing the map sources files.
Pro Offline maps
Offline maps using "folders of PNG files" or sqlite database.
Cons
Con No longer actively developed
Last updated 2017-02, reviews on Google Play show developer no longer responds to contacts and bugs are increasing as new phones become incompatible with its features.
Con No navigation
This app only displays map images. It has no concept of road paths, etc. and therefore is incapable of navigating them. It can show a target location with a straight line leading to it, though, and you could conceivably load a track into it to follow, but you'd have to generate the track elsewhere.
Con No support for vector maps
Raster maps are necessary for satellite imagery, etc. but take up a lot more space than vector maps.
Con Default map format is unwieldy
Saving thousands of small PNG files is wasteful of SD storage (slack space) and makes it very slow to migrate from one phone to another or backup phone, etc.
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