Garmin 510. Haven't been able to update it for (a year?) Whatever, a looong time. Express says the reason is there is not enough free space on the unit. (Have cleared all files a few times now, and factory reset twice). Same problem persists. Current problem is Iphone SE connects and disconnects every 5 mins or so (no joke) and the constant beeping drives me nuts (only "fix" I've found so far is to turn off "Sounds" altogether so at least the beeping is not ... beeping.) This problem, the disconnecting and reconnecting had only escalated over the last few weeks. Have contacted Garmin several times and have received no useable info at all. They only tell me to fart around with files on my POc etc. Nothing they've suggested had made the slighted bit of difference. Based on what I've observed of Garmin products owned by me and by friends both bicycle and motorcycle I've concluded I have no confidence in purchasing Garmin products any further. Thinking new WAHOO or LEYZNE. Thoughts?