Read reviews for the PN-30 (GPS) by Delorme as submitted by your fellow paddlers. All of the reviews are created and written by paddlers like you, so be sure to submit your own review and be part of the community!
Scouting the rapids before by land then flagging the hazards made navigation more fun.
FYI I used the strap to wrap it to the thwart and left the unit on the floor of the canoe in the rapids and left it balanced on the thwart on flat water.
The unit gets a 10 however the 8 reflects how long it takes to download maps via Topo 8 and the super slow map server Delorme have.