I sympathize with the directionally challenged!!! Woe is me if the sun isn't shining
I've considered a Garmin, but I've been using the Navigon app on my iPhone 4 and I'm happy with it. It cost about $80 and comes with free updates. It has kept me on course in town, from here to the East Coast, to Florida, to Michigan, to the West Coast and back, and has been right about 99.9% of the time....but I still wouldn't take a dirt road if it told me to.
My brother has a Garmin Nuvi 285W that he bought for around $100. This model has been discontinued, but he bought a life-time update for a one-time fee of $70 when he bought it. He can update it 3 times a year. He would only buy another Garmin, not another name brand.
We bought a less expensive Garmin for our father, but there are no updates to it. The updates are well worth the money, if you travel out of town (Daddy, at 81 years old, just drives in town).
What are the best features that I like?
--Mine shows how many lanes are on the Interstates at exits. It tells me what lanes to get in.
--I do know the voice can be changed on the Garmin.....I have to put up with "Betty", I don't have a choice.
--Both the Garmin and Navigon give me enough warning to get into the correct lane.
--The Garmin does the audible "recalculating" thing...Navigon just recalculates and then tells me which way to go with the new direction I'm going.
--I can change the Navigon so it always has north at the top, or I can change and have the direction I'm going always at the top (I keep the direction I heading at the top). I do not know if Garmin has this feature.
--Both can show upcoming construction.
I hope these rambling thoughts help.
Oh yeah: "There models that will access the OBD II connector and tune the ECM to I have no idea what." I just looked both up on Wikipedia.....I still don't understand
Verna