Bought the Lowrence mainly because of the large clear to read screen and loud, clear speaker - others I looked at are not anywhere as good in that regard.

Features:

• Floats : Waterproof IPX7 - 1 metre underwater 30 minutes.
• 128 x 128 LCD display
• Adjustable contrast and backlight with a clear display
• Choice of power setting between 5W to 1W. Expect average 5-10km distance at sea level depending on wave height.
• “Get Buddy” feature transmits the radio’s position by push of a button, allowing buddies to receive bearing and distance data from other Link-2 units. 
• Buddy list of up to 20 people
• Latitude, Longitude and time display
• Distress call button with hinged door to prevent accidental use
• Dedicated keys for up to 3 chosen channels
• Flexible dual and tri-watch for greater channel monitoring
• Full Class D DSC compliant
• NMEA 0183 output from the charger base
• 300 waypoints
• 12 channel GPS receiver with great circle navigation, lat/lon display, track plotter & local waypoint icons.
• Plotter: 12 range scales and 360 point track history.
• Battery Life: 1400 mAh Lithium Polymer : 7 hours 5w, 12 hours 1w (based on 5-5-90% ratio & GPS on). Automatically switches to battery saver mode after 10 second TX lapse.
• Supplied with Rubber duck Antenna and AC desktop charging cradle.

Here is a link to the manual:

https://d1ftp75gsnhq96.cloudfront.net/uploads/Lowrance/VHF/Link-2%20User%20Manual.pdf

Price say $170

Please give me a call if you need any more info.  0409448890 anytime.