http://ota.telenav.com/ota/sn
gets the regular TeleNav. It has 5.5.24 for the HTC Rhodium (the Touch Pro 2), and nothing at all for the Samsung Intercept.
http://ota.telenav.com/ota/sn/nav
is the hyperlink specific to Sprint Navigation. It has 2.8.0.18 for the HTC Rhodium (Touch Pro 2), and 2.8 for the Samsung SPH-M910 (Intercept).