Is there a good and affordable marine navigation software for OS X or Windows that includes charts? Offline usage is a must, as there's no reliable internet connection after leaving coast.
Mandatory features include
- Shows water depth, sea markers (buoys etc.). "The usual stuff"
- Shows current location on the map, based on GPS. Preferably works with any NMEA device, but requiring specific (cheap, say, <50€) GPS is okay too.
- Shows speed and course
- High-quality charts for Europe (other parts of the world are obviously a plus). OpenSeaMap is rather incomplete.
- Price including charts less than 200€
Optional things - "nice to have":
- Night colors mode - during night, having dark theme (in addition to adjusting brightness of the display) is really useful for preserving night vision.
- Recording tracks and showing recorded tracks
- Custom markers - adding markers to locations with custom description.
- AIS support (shows other boats on the map)
- GRIB support (weather information)
Here's an example of good map view (without boat location): it includes stones, land, depths, buoys, lighthouses (with sector colors), underwater pipes etc.
OpenCPN is free with good feature set. Unfortunately, marine charts for European countries are usually crazy expensive - for Finland's coast, a full set of OpenCPN compatible electronic charts costs approximately 1000€ ($1351.40). That isn't too much for professional usage, but for private use, it's pretty steep.
For Android, there's Navionics, which is affordable (35€/$47.31) and includes charts for whole Europe (different edition for Northern America).