inexpensive GPS/fishfinder?

[Markstanco]

i am putting an order together today for my Father, he just bought a pontoon boat. Anybody have any suggestions for me on this? Getting it on BF.com but there are a LOT of choices....

on edit: It needs to have an EXTERNAL antenna for the GPS

 

[L Hall]

http://www.boatfix.com/bykeywordnew2ele.asp?textfield=010-00259-00R&texttype=2&submit=Search for a gps only. This is probably the best bet for a combo

http://www.boatfix.com/bykeywordnew2ele.asp?textfield=117-38&texttype=2&submit=Search