yes, GPS is worth it.especially if you fish a lot of tournaments or a lot of places where you fish offshore structure.i have 3 electronics units on my Triton, and all three are GPS units.two Lowrance's, and a garmin 2006c.the Lowrance units ,especially the 332Ci up front has had several problems.the internal antenna on the 332 is a pain in the butt, but the X15 in the dash has the external antenna and the Garmin 2006c is an external antenna model also.the Garmin is an awesome unit, and i will probably never purchase another Lowrance unit due to the continuous problems i have with the lowrance units i have purchased.i have had the garmin for two years now and not had a problem.I've had the LMS 332Ci for a year,just put it on at the beginning of last year's tourny season,and i have had several problems with the unit.also, Lowrance was not able to fix the unit when sent back to the factory...twice.and they would not send a replacement unit.but, i have purchased a new unit for this year's tourny season and i have been very satisfied with it so far.hope this helps