This format can...
read and write waypoints
read and write tracks
read and write routes
The Lowrance iFinder GPS series has the unique capability to output its data to an MMC card. The data is saved to the card as a .USR file and can be read by your computer using a card reader. Waypoints, icons, routes, tracks are supported. Event marker icons contain a symbol, name, latitude and longitude only. By default, Event marker icons are converted to waypoints on read. On write, you are able to create icons from waypoints.
Ignore event marker icons on read.
This option instructs GPSBabel to not convert icons to waypoints on input, but to instead disregard them altogether
Treat waypoints as icons on write.
(USR output) This option converts the waypoint information to an event marker icon.
(USR output) Merge into one segmented track.
(USR output) This option merges all tracks into a single track with multiple segments.
(USR input) Break segments into separate tracks.
(USR input) Break track segments into separate tracks. file.
(USR output) Write version.
Newer (post 2006 or so) Lowrance devices added a version three of their .usr file format that adds depth. Specify "3" here to use that format on write.
gpsbabel ... -o lowranceusr,wversion=2 -F blah.usr
is exactly the same as
gpsbabel ... -o lowranceusr -F blah.usr
To create a file that contains depth but therefore isn't usable
on older Lowrance products, use this:
gpsbabel ... -o lowranceusr,wversion=3 -F blah.usr