Updating GPS data?
There has recently been some discussion on this forum about GPS, and its use for navigation here in the UK. The consensus appeared to be that if you've got it, use it but don't rely on it as a primary navigation tool.
I agree with that consensus view. However, in my aircraft there is installed a Garmin GNC250XL which uses a Jeppesen NavData card. This is out of date (by some 3 years).
If I only use GPS as secondary back-up to the trusty Mk 1a eyeball and an up-to-date map, are there any pressing reasons to go to the expense (~£350) of annual udates to the NavData card?