Do I need a GPS in Alaska?

X3 on Church's book. As for GPS blind spots we have not encountered that problem and have driven from Tok to Deadhorse to Homer to Valdez and back to Tok via McCarthy. Our Garmin was setting on the dash of the motorhome with no external antenna! Probably 90% of the Cubs and Super Cubs use GPS as their primary means of navigating in Alaska. Now if you want to talk about DirecTV that is another kettle of fish altogether. I don't believe our satellite dish worked anywhere in Alaska! That's where the Southern horizon and mountains come into play. The satellites are approximately 10 degrees off the horizon and blocked by mountains or trees in Alaska from reception with the smaller rv dish. (It was kind of nice not having tv for most of 5 months!). Sirius radio worked occasionally until we got North of Wasilla, then nothing.